$MSEX
MIDDLESEX WATER CO Stock $msex

$msex Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000117494724000281 Filed on March 01, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023 Q3
Revenue	$40.49M	$38.60M	$46.69M
YoY Change	6.26%	-0.57%	-2.11%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.979M	$6.648M	$6.376M
YoY Change	-16.97%	-9.43%	9.67%
% of Gross Profit
Operating Expenses	$30.66M	$30.36M	$33.89M
YoY Change	-0.02%	-1.03%	8.78%
Operating Profit	$9.865M	$8.242M	$12.82M
YoY Change	31.71%	1.17%	-22.64%
Interest Expense	$3.269M	-$3.779M	$3.518M
YoY Change	25.97%	35.3%	49.38%
% of Operating Profit	33.14%	-45.85%	27.44%
Other Income/Expense, Net	$5.365M	$1.201M	$1.432M
YoY Change	213.56%	-0.25%	-29.77%
Pretax Income	$11.96M	$5.665M	$10.74M
YoY Change	81.06%	-22.6%	-33.97%
Income Tax	$1.279M	-$102.0K	$746.0K
% Of Pretax Income	10.69%	-1.8%	6.95%
Net Earnings	$10.68M	$5.765M	$9.990M
YoY Change	82.04%	-19.58%	-30.1%
Net Earnings / Revenue	26.38%	14.93%	21.4%
Basic Earnings Per Share	$0.60	$0.32	$0.56
Diluted Earnings Per Share	$0.59	$0.32	$0.56
COMMON SHARES
Basic Shares Outstanding	17.82M shares	17.81M shares	17.75M shares
Diluted Shares Outstanding	17.93M shares		17.87M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.855M	$2.390M	$3.000M
YoY Change	-41.28%	-37.57%	3.16%
Cash & Equivalents	$2.855M	$2.390M	$2.970M
Short-Term Investments
Other Short-Term Assets	$15.68M	$11.13M	$14.20M
YoY Change	24.73%	-1.36%	-3.34%
Inventory	$7.072M	$6.972M	$6.400M
Prepaid Expenses	$4.371M	$1.833M	$2.918M
Receivables	$15.73M	$18.17M	$18.99M
Other Receivables	$69.87M	$69.87M	$93.20M
Total Short-Term Assets	$111.2M	$108.5M	$135.8M
YoY Change	181.4%	190.93%	227.36%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.024B	$1.013B	$1.000B
YoY Change	7.0%	8.28%	9.32%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$39.00K	$62.00K	$51.00K
YoY Change	0.0%	226.32%	-51.43%
Total Long-Term Assets	$1.139B	$1.128B	$1.108B
YoY Change	7.5%	8.71%	8.25%
TOTAL ASSETS
Total Short-Term Assets	$111.2M	$108.5M	$135.8M
Total Long-Term Assets	$1.139B	$1.128B	$1.108B
Total Assets	$1.250B	$1.236B	$1.243B
YoY Change	13.76%	15.04%	16.79%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$23.24M	$27.62M	$28.60M
YoY Change	-15.86%	11.15%	10.56%
Accrued Expenses	$2.650M	$3.138M	$3.100M
YoY Change	-14.46%	-3.0%	7.86%
Deferred Revenue		$1.390M
YoY Change
Short-Term Debt	$58.00M	$42.80M	$42.30M
YoY Change	103.51%	-22.88%	4.44%
Long-Term Debt Due	$363.6M	$7.740M	$7.444M
YoY Change	1983.91%	-55.68%	-1.63%
Total Short-Term Liabilities	$117.2M	$103.8M	$121.3M
YoY Change	22.07%	-11.9%	30.48%
LONG-TERM LIABILITIES
Long-Term Debt	$357.0M	$358.2M	$354.3M
YoY Change	8.29%	23.38%	17.61%
Other Long-Term Liabilities	$498.0K	$592.0K	$681.0K
YoY Change	-40.5%	-35.58%	-32.17%
Total Long-Term Liabilities	$357.5M	$358.7M	$355.0M
YoY Change	8.17%	23.2%	17.44%
TOTAL LIABILITIES
Total Short-Term Liabilities	$117.2M	$103.8M	$121.3M
Total Long-Term Liabilities	$357.5M	$358.7M	$355.0M
Total Liabilities	$474.6M	$462.6M	$476.3M
YoY Change	11.29%	13.08%	20.51%
SHAREHOLDERS EQUITY
Retained Earnings	$181.1M	$176.2M	$176.3M
YoY Change	8.08%	5.35%	6.45%
Common Stock	$246.6M	$246.8M	$243.3M
YoY Change	4.58%	5.88%	4.66%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$427.7M	$423.0M	$419.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.250B	$1.236B	$1.243B
YoY Change	13.76%	15.04%	16.79%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023 Q3
OPERATING ACTIVITIES
Net Income	$10.68M	$5.765M	$9.990M
YoY Change	82.04%	-19.58%	-30.1%
Depreciation, Depletion And Amortization	$5.979M	$6.648M	$6.376M
YoY Change	-16.97%	-9.43%	9.67%
Cash From Operating Activities	$6.652M	$12.79M	$10.70M
YoY Change	-58.35%	-25.28%	-38.43%
INVESTING ACTIVITIES
Capital Expenditures	$14.39M	$17.11M	$22.43M
YoY Change	-41.31%	-32.63%	-15.66%
Acquisitions
YoY Change
Other Investing Activities			$0.00
YoY Change
Cash From Investing Activities	-$14.39M	-$17.11M	-$22.43M
YoY Change	-41.31%	-32.63%	-15.66%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net	$1.539M
YoY Change	-0.9%
Cash From Financing Activities	$8.202M	3.729M	10.33M
YoY Change	-14.38%	-59.45%	32.37%
NET CHANGE
Cash From Operating Activities	$6.652M	12.79M	10.70M
Cash From Investing Activities	-$14.39M	-17.11M	-22.43M
Cash From Financing Activities	$8.202M	3.729M	10.33M
Net Change In Cash	$465.0K	-588.0K	-1.400M
YoY Change	-55.03%	-163.91%	-0.85%
FREE CASH FLOW
Cash From Operating Activities	$6.652M	$12.79M	$10.70M
Capital Expenditures	$14.39M	$17.11M	$22.43M
Free Cash Flow	-$7.737M	-$4.317M	-$11.73M
YoY Change	-9.46%	-47.84%	27.28%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary		usd
CY2023	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary		usd
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	0-422
CY2023	dei	Entity Registrant Name EntityRegistrantName	MIDDLESEX WATER COMPANY
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NJ
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	22-1114430
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	485C Route 1 South
CY2023	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 400
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Iselin
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	08830
CY2023	dei	City Area Code CityAreaCode	(732)
CY2023	dei	Local Phone Number LocalPhoneNumber	634-1500
CY2023	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
CY2023	dei	Trading Symbol TradingSymbol	MSEX
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	1395620526	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17821670	shares
CY2023	dei	Auditor Name AuditorName	Baker Tilly US, LLP
CY2023	dei	Auditor Location AuditorLocation	Philadelphia
CY2023	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	166274000	usd
CY2022	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	162434000	usd
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	usd
CY2023	msex	Operations And Maintenance OperationsAndMaintenance	83113000	usd
CY2022	msex	Operations And Maintenance OperationsAndMaintenance	79096000	usd
CY2021	msex	Operations And Maintenance OperationsAndMaintenance	73671000	usd
CY2023	us-gaap	Depreciation Depreciation	25194000	usd
CY2022	us-gaap	Depreciation Depreciation	23029000	usd
CY2021	us-gaap	Depreciation Depreciation	21109000	usd
CY2023	us-gaap	Taxes Other TaxesOther	18744000	usd
CY2022	us-gaap	Taxes Other TaxesOther	18208000	usd
CY2021	us-gaap	Taxes Other TaxesOther	15150000	usd
CY2023	us-gaap	Operating Expenses OperatingExpenses	127051000	usd
CY2022	us-gaap	Operating Expenses OperatingExpenses	120333000	usd
CY2021	us-gaap	Operating Expenses OperatingExpenses	109930000	usd
CY2022	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary	5232000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	39223000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	47333000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	33211000	usd
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2433000	usd
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2314000	usd
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2653000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4052000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	5389000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3305000	usd
CY2023	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6485000	usd
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	7703000	usd
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	5958000	usd
CY2023	us-gaap	Interest Expense InterestExpense	13143000	usd
CY2022	us-gaap	Interest Expense InterestExpense	9367000	usd
CY2021	us-gaap	Interest Expense InterestExpense	8114000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32565000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	45669000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31055000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2023	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31404000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	42309000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.77
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.4
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.39
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17732	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17597	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17847	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17712	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17607	shares
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	303791000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	249153000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	809862000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	735138000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Common PublicUtilitiesPropertyPlantAndEquipmentCommon	100593000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Common PublicUtilitiesPropertyPlantAndEquipmentCommon	97581000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	19636000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	53570000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1233882000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1135442000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	235540000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	214891000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	998342000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	920551000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2390000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3828000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2137000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2326000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	18172000	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	16018000	usd
CY2023Q4	msex	Litigation Settlements Receivable LitigationSettlementsReceivable	69872000	usd
CY2023Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	9297000	usd
CY2022Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	8659000	usd
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	6972000	usd
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	6177000	usd
CY2023Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	1833000	usd
CY2022Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	2624000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	108536000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	37306000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3185000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3826000	usd
CY2023Q4	msex	Preliminary Survey And Investigation Charges Non Current PreliminarySurveyAndInvestigationChargesNonCurrent	1932000	usd
CY2022Q4	msex	Preliminary Survey And Investigation Charges Non Current PreliminarySurveyAndInvestigationChargesNonCurrent	2806000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	90694000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	90046000	usd
CY2023Q4	msex	Nonutility Assets Net Non Current NonutilityAssetsNetNonCurrent	11522000	usd
CY2022Q4	msex	Nonutility Assets Net Non Current NonutilityAssetsNetNonCurrent	11207000	usd
CY2023Q4	msex	Employee Benefit Plans EmployeeBenefitPlans	21779000	usd
CY2022Q4	msex	Employee Benefit Plans EmployeeBenefitPlans	8689000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	62000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	19000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	129174000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	116593000	usd
CY2023Q4	us-gaap	Assets Assets	1236052000	usd
CY2022Q4	us-gaap	Assets Assets	1074450000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	246764000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	233054000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	176227000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	167274000	usd
CY2023Q4	us-gaap	Partners Capital PartnersCapital	422991000	usd
CY2022Q4	us-gaap	Partners Capital PartnersCapital	400328000	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	358153000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	290280000	usd
CY2023Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	783228000	usd
CY2022Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	692692000	usd
CY2023Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	7740000	usd
CY2022Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	17462000	usd
CY2023Q4	us-gaap	Notes Payable Current NotesPayableCurrent	42750000	usd
CY2022Q4	us-gaap	Notes Payable Current NotesPayableCurrent	55500000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	27618000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	24847000	usd
CY2023Q4	msex	Litigation Settlement Payable LitigationSettlementPayable	6237000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	10535000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	12162000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	3138000	usd
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	2535000	usd
CY2023Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	1390000	usd
CY2022Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	1365000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	4421000	usd
CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	3988000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	103829000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	117859000	usd
CY2023Q4	msex	Construction Advances ConstructionAdvances	21313000	usd
CY2022Q4	msex	Construction Advances ConstructionAdvances	21382000	usd
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	3063000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	3706000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	88736000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	77783000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	113021000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	46734000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	592000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	919000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	226725000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	150524000	usd
CY2023Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	122270000	usd
CY2022Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	113375000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1236052000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1074450000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	29442000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	27475000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	26799000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5599000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5334000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-10989000	usd
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1458000	usd
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1387000	usd
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1505000	usd
CY2023	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	300000	usd
CY2022	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-401000	usd
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	136000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	2214000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	1630000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	1338000	usd
CY2022	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary	5232000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2154000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	707000	usd
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	742000	usd
CY2023	msex	Increase Decreasein Unbilled Revenues IncreaseDecreaseinUnbilledRevenues	638000	usd
CY2022	msex	Increase Decreasein Unbilled Revenues IncreaseDecreaseinUnbilledRevenues	1386000	usd
CY2021	msex	Increase Decreasein Unbilled Revenues IncreaseDecreaseinUnbilledRevenues	208000	usd
CY2023	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	795000	usd
CY2022	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	819000	usd
CY2021	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	246000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-791000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-256000	usd
CY2021	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-6000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2771000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3722000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-9318000	usd
CY2023	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-1627000	usd
CY2022	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	3541000	usd
CY2021	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-1517000	usd
CY2023	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	603000	usd
CY2022	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	549000	usd
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-151000	usd
CY2023	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-1340000	usd
CY2022	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-4266000	usd
CY2021	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-2645000	usd
CY2023	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	25000	usd
CY2022	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	35000	usd
CY2021	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	75000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	677000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-454000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	4276000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	52782000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	61361000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	33028000	usd
CY2023	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	975000	usd
CY2022	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	927000	usd
CY2021	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	1148000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	90179000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	91335000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	79378000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3122000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-90179000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-88213000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-79378000	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	17463000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7423000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	52691000	usd
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	75812000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2662000	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	86595000	usd
CY2023	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-12750000	usd
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	42500000	usd
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	11000000	usd
CY2023	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	131000	usd
CY2022	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	624000	usd
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	994000	usd
CY2023	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	10000	usd
CY2022	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	32000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	619000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12115000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	10335000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3837000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22441000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20810000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19373000	usd
CY2023	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	120000	usd
CY2022	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	120000	usd
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	120000	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1566000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	659000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	11225000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	35959000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	27147000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	39479000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-1438000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	295000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6871000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3828000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3533000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10404000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2390000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3828000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3533000	usd
CY2023	us-gaap	Contribution Of Property ContributionOfProperty	7259000	usd
CY2022	us-gaap	Contribution Of Property ContributionOfProperty	6252000	usd
CY2021	us-gaap	Contribution Of Property ContributionOfProperty	4750000	usd
CY2021	msex	Longterm Debt Deobligation LongtermDebtDeobligation	64000	usd
CY2022	msex	Non Cash Consideration For Sale Of Subsidiary NonCashConsiderationForSaleOfSubsidiary	2100000	usd
CY2023	msex	Litigation Settlement Receivable LitigationSettlementReceivable	69872000	usd
CY2023Q4	msex	Litigation Settlement Payable LitigationSettlementPayable	6237000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	12762000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	9251000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	8546000	usd
CY2023	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	975000	usd
CY2021	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1148000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2962000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3335000	usd
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17821000	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17642000	shares
CY2023Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	246764000	usd
CY2022Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	233054000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	176227000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	167274000	usd
CY2023Q4	us-gaap	Partners Capital PartnersCapital	422991000	usd
CY2022Q4	us-gaap	Partners Capital PartnersCapital	400328000	usd
CY2023Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	120000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	35959000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	27147000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	39479000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-1438000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	295000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6871000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3828000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3533000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10404000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2390000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3828000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3533000	usd
CY2023	us-gaap	Contribution Of Property ContributionOfProperty	7259000	usd
CY2022	us-gaap	Contribution Of Property ContributionOfProperty	6252000	usd
CY2021	us-gaap	Contribution Of Property ContributionOfProperty	4750000	usd
CY2021	msex	Longterm Debt Deobligation LongtermDebtDeobligation	64000	usd
CY2022	msex	Non Cash Consideration For Sale Of Subsidiary NonCashConsiderationForSaleOfSubsidiary	2100000	usd
CY2023	msex	Litigation Settlement Receivable LitigationSettlementReceivable	69872000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	12762000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	9251000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	8546000	usd
CY2023	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	975000	usd
CY2022	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	927000	usd
CY2021	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1148000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2962000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3230000	usd
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17642000	shares
CY2023Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	246764000	usd
CY2022Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	233054000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	176227000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	167274000	usd
CY2023Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	120000	usd
CY2022Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	120000	usd
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2023	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	2084000	usd
CY2022	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	2084000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	364736000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	306387000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	6529000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	6873000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5372000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5518000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7740000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	17462000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	358153000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	290280000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	346208000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3837000	usd
CY2022Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	120000	usd
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2023	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	2084000	usd
CY2022	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	2084000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	364736000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	306387000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	6529000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	6873000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5372000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5518000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7740000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	17462000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	358153000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	290280000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	346208000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3837000	usd
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	350000	usd
CY2021	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	281000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19373000	usd
CY2021	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	367726000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2022	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	10335000	usd
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	520000	usd
CY2022	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	280000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20810000	usd
CY2022	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	usd
CY2022	us-gaap	Stockholders Equity Other StockholdersEquityOther	-32000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	12115000	usd
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1235000	usd
CY2023	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	360000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	22441000	usd
CY2023	us-gaap	Stockholders Equity Other StockholdersEquityOther	-10000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	422991000	usd
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	350000	usd
CY2021	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	281000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19373000	usd
CY2021	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	367726000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2022	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	10335000	usd
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	520000	usd
CY2022	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	280000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20810000	usd
CY2022	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	usd
CY2022	us-gaap	Stockholders Equity Other StockholdersEquityOther	-32000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	400328000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	12115000	usd
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1235000	usd
CY2023	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	360000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	22441000	usd
CY2023	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	usd
CY2023	us-gaap	Stockholders Equity Other StockholdersEquityOther	-10000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	422991000	usd
CY2023	msex	Percentage Of Voting Interest PercentageOfVotingInterest	0.50	pure
CY2023	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	806000	usd
CY2022	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	831000	usd
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	929000	usd
CY2023	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	453000	usd
CY2022	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	440000	usd
CY2023	msex	Percentage Of Voting Interest PercentageOfVotingInterest	0.50	pure
CY2023	msex	Percentage Of Operating Revenues PercentageOfOperatingRevenues	0.93	pure
CY2023	msex	Percentage Of Total Assets PercentageOfTotalAssets	0.99	pure
CY2023	msex	Industrial Operating Revenues IndustrialOperatingRevenues	11586000	usd
CY2022	msex	Industrial Operating Revenues IndustrialOperatingRevenues	11152000	usd
CY2021	msex	Industrial Operating Revenues IndustrialOperatingRevenues	8990000	usd
CY2023	msex	Fire Protection Operating Revenues FireProtectionOperatingRevenues	12582000	usd
CY2023	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	19117000	usd
CY2022	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	18769000	usd
CY2021	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14590000	usd
CY2023	msex	Nonregulated Contract Operations Revenue NonregulatedContractOperationsRevenue	12320000	usd
CY2023	msex	Percentage Of Operating Revenues PercentageOfOperatingRevenues	0.93	pure
CY2023	msex	Percentage Of Total Assets PercentageOfTotalAssets	0.99	pure
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2100000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2300000	usd
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	500000	usd
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	900000	usd
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	1200000	usd
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	700000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	400000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2100000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2300000	usd
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000	usd
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	500000	usd
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	900000	usd
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	1200000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	400000	usd
CY2023	msex	Residential Operating Revenues ResidentialOperatingRevenues	86581000	usd
CY2022	msex	Residential Operating Revenues ResidentialOperatingRevenues	84950000	usd
CY2021	msex	Residential Operating Revenues ResidentialOperatingRevenues	77699000	usd
CY2023	msex	Commercial Operating Revenues CommercialOperatingRevenues	23945000	usd
CY2022	msex	Commercial Operating Revenues CommercialOperatingRevenues	22689000	usd
CY2021	msex	Commercial Operating Revenues CommercialOperatingRevenues	16715000	usd
CY2023	msex	Residential Operating Revenues ResidentialOperatingRevenues	86581000	usd
CY2022	msex	Residential Operating Revenues ResidentialOperatingRevenues	84950000	usd
CY2021	msex	Residential Operating Revenues ResidentialOperatingRevenues	77699000	usd
CY2023	msex	Commercial Operating Revenues CommercialOperatingRevenues	23945000	usd
CY2022	msex	Commercial Operating Revenues CommercialOperatingRevenues	22689000	usd
CY2021	msex	Commercial Operating Revenues CommercialOperatingRevenues	16715000	usd
CY2023	msex	Industrial Operating Revenues IndustrialOperatingRevenues	11586000	usd
CY2022	msex	Industrial Operating Revenues IndustrialOperatingRevenues	11152000	usd
CY2021	msex	Industrial Operating Revenues IndustrialOperatingRevenues	8990000	usd
CY2023	msex	Fire Protection Operating Revenues FireProtectionOperatingRevenues	12582000	usd
CY2022	msex	Fire Protection Operating Revenues FireProtectionOperatingRevenues	12726000	usd
CY2021	msex	Fire Protection Operating Revenues FireProtectionOperatingRevenues	12608000	usd
CY2023	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	19117000	usd
CY2022	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	18769000	usd
CY2021	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14590000	usd
CY2023	msex	Nonregulated Contract Operations Revenue NonregulatedContractOperationsRevenue	12320000	usd
CY2022	msex	Nonregulated Contract Operations Revenue NonregulatedContractOperationsRevenue	12006000	usd
CY2021	msex	Nonregulated Contract Operations Revenue NonregulatedContractOperationsRevenue	12391000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	166131000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	162292000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	142993000	usd
CY2022	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	831000	usd
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	929000	usd
CY2023	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	453000	usd
CY2022	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	440000	usd
CY2021	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	427000	usd
CY2023	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1116000	usd
CY2022	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1129000	usd
CY2021	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1208000	usd
CY2023	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	166274000	usd
CY2022	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	162434000	usd
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	usd
CY2021	msex	Nonregulated Contract Operations Revenue NonregulatedContractOperationsRevenue	12391000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	166131000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	162292000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	142993000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1117000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1296000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1499000	usd
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	55000	usd
CY2021	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	427000	usd
CY2023	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1116000	usd
CY2022	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1129000	usd
CY2021	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1208000	usd
CY2023	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	166274000	usd
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><b>(q) Use of Estimates</b> - Conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts in the financial statements. Actual results could differ from those estimates.</p>
CY2023	msex	Obligation To Pay Percentage ObligationToPayPercentage	0.30	pure
CY2023	us-gaap	Proceeds From Fees Received ProceedsFromFeesReceived	29500000	usd
CY2023	msex	Base Rate Amount BaseRateAmount	563100000	usd
CY2023	us-gaap	Public Utilities Approved Return On Equity Percentage PublicUtilitiesApprovedReturnOnEquityPercentage	0.096	pure
CY2023Q4	msex	Distribution System Improvement Charge Rate DistributionSystemImprovementChargeRate	0.05	pure
CY2023Q4	msex	Base Rate Amount BaseRateAmount	5500000	usd
CY2021Q4	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	27700000	usd
CY2022Q1	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	20700000	usd
CY2024Q1	msex	Distribution System Improvement Charge Rate DistributionSystemImprovementChargeRate	0.0371	pure
CY2022Q3	msex	Effective Percentage Of Service Rendered EffectivePercentageOfServiceRendered	0.06	pure
CY2021Q1	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	1000000	usd
CY2023Q1	msex	Threshold Percentage Increased In Capital Expenditure ThresholdPercentageIncreasedInCapitalExpenditure	0.0539	pure
CY2023	msex	Percentag Of Consumer Price Index PercentagOfConsumerPriceIndex	0.03	pure
CY2023Q4	us-gaap	Regulatory Assets RegulatoryAssets	90694000	usd
CY2022Q4	us-gaap	Regulatory Assets RegulatoryAssets	90046000	usd
CY2023	us-gaap	Legal Fees LegalFees	63600000	usd
CY2023Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	28200000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><b>(q) Use of Estimates</b> - Conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts in the financial statements. Actual results could differ from those estimates.</p>
CY2023	msex	Obligation To Pay Percentage ObligationToPayPercentage	0.30	pure
CY2023	us-gaap	Proceeds From Fees Received ProceedsFromFeesReceived	29500000	usd
CY2023	msex	Base Rate Amount BaseRateAmount	563100000	usd
CY2023	us-gaap	Public Utilities Approved Return On Equity Percentage PublicUtilitiesApprovedReturnOnEquityPercentage	0.096	pure
CY2023Q4	msex	Distribution System Improvement Charge Rate DistributionSystemImprovementChargeRate	0.05	pure
CY2023Q4	msex	Base Rate Amount BaseRateAmount	5500000	usd
CY2021Q4	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	27700000	usd
CY2022Q1	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	20700000	usd
CY2024Q1	msex	Distribution System Improvement Charge Rate DistributionSystemImprovementChargeRate	0.0371	pure
CY2022Q3	msex	Effective Percentage Of Service Rendered EffectivePercentageOfServiceRendered	0.06	pure
CY2021Q1	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	1000000	usd
CY2023Q1	msex	Threshold Percentage Increased In Capital Expenditure ThresholdPercentageIncreasedInCapitalExpenditure	0.0539	pure
CY2023	msex	Percentag Of Consumer Price Index PercentagOfConsumerPriceIndex	0.03	pure
CY2023Q4	us-gaap	Regulatory Assets RegulatoryAssets	90694000	usd
CY2022Q4	us-gaap	Regulatory Assets RegulatoryAssets	90046000	usd
CY2023	us-gaap	Legal Fees LegalFees	63600000	usd
CY2023Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	28200000	usd
CY2022Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	29000000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6839000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9590000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6521000	usd
CY2023	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1495000	usd
CY2022	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1106000	usd
CY2021	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1290000	usd
CY2023	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-5475000	usd
CY2022	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-6767000	usd
CY2022Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	29000000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	227000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6839000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9590000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6521000	usd
CY2023	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1495000	usd
CY2022	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1106000	usd
CY2021	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1290000	usd
CY2023	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-5475000	usd
CY2022	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-6767000	usd
CY2021	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-12281000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1117000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1296000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1499000	usd
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	55000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	227000	usd
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	63000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2952000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	425000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-8247000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1066000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1381000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1467000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3261000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1242000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	933000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	348000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	260000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	431000	usd
CY2023	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-64000	usd
CY2022	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-68000	usd
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-72000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2022Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3568000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	7100000	usd
CY2023Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	240000	usd
CY2022Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	304000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-612000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-671000	usd
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	63000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2952000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	425000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-8247000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1066000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1381000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3261000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1242000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	933000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	348000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	260000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	431000	usd
CY2023	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-64000	usd
CY2022	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-68000	usd
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-72000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	84330000	usd
CY2022Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	72996000	usd
CY2022Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3568000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	7100000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	7380000	usd
CY2023Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	240000	usd
CY2022Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	304000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-612000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-671000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	88736000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	77783000	usd
CY2023	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	27000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	88736000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	77783000	usd
CY2023Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	84330000	usd
CY2023	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	27000000	usd
CY2022Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	72996000	usd
CY2023Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3546000	usd
CY2023	msex	Cost Of Untreated Water CostOfUntreatedWater	3200000	usd
CY2022	msex	Cost Of Untreated Water CostOfUntreatedWater	3200000	usd
CY2021	msex	Cost Of Untreated Water CostOfUntreatedWater	3300000	usd
CY2023	msex	Cost Of Treated Water CostOfTreatedWater	5300000	usd
CY2022	msex	Cost Of Treated Water CostOfTreatedWater	3900000	usd
CY2023	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	8500000	usd
CY2022	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	7100000	usd
CY2023Q4	msex	Estimated Incremental Borrowing Rate EstimatedIncrementalBorrowingRate	0.0403	pure
CY2023	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2022	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2023Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	usd
CY2022Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	usd
CY2023Q4	msex	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	4100000	usd
CY2022Q4	msex	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	3500000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3200000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5200000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1500000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3700000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	3100000	usd
CY2024Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	75000000	usd
CY2025Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	81000000	usd
CY2026Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	70000000	usd
CY2026Q4	msex	Estimatedobligationexpenditure Estimatedobligationexpenditure	6700000	usd
CY2023	msex	Cost Of Untreated Water CostOfUntreatedWater	3200000	usd
CY2022	msex	Cost Of Untreated Water CostOfUntreatedWater	3200000	usd
CY2021	msex	Cost Of Untreated Water CostOfUntreatedWater	3300000	usd
CY2023	msex	Cost Of Treated Water CostOfTreatedWater	5300000	usd
CY2022	msex	Cost Of Treated Water CostOfTreatedWater	3900000	usd
CY2021	msex	Cost Of Treated Water CostOfTreatedWater	3600000	usd
CY2023	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	8500000	usd
CY2022	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	7100000	usd
CY2021	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6900000	usd
CY2023Q4	msex	Estimated Incremental Borrowing Rate EstimatedIncrementalBorrowingRate	0.0403	pure
CY2023	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2022	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	usd
CY2023Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	usd
CY2022Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	usd
CY2023Q4	msex	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	4100000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3200000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5200000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1500000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3700000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	3100000	usd
CY2024Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	75000000	usd
CY2025Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	81000000	usd
CY2026Q4	msex	Budgeted Construction Cost BudgetedConstructionCost	70000000	usd
CY2026Q4	msex	Estimatedobligationexpenditure Estimatedobligationexpenditure	6700000	usd
CY2023	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	35700000	usd
CY2023	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	35700000	usd
CY2022	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	28900000	usd
CY2023	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0613	pure
CY2022	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0334	pure
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	42800000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	55500000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.065	pure
CY2022Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0517	pure
CY2023Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	140000000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	42800000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	97200000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	140000000	usd
CY2023Q1	msex	Percentage Of Discount Purchase Of Common Stock In Investment Plan PercentageOfDiscountPurchaseOfCommonStockInInvestmentPlan	0.03	pure
CY2023Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	700000	shares
CY2023Q4	msex	Additional Shares Authorized By Sec To Be Issued AdditionalSharesAuthorizedBySECToBeIssued	700000	shares
CY2023Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1000000	shares
CY2023Q2	msex	Borrowed Loan BorrowedLoan	20000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	7700000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	7600000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	7400000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	7200000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	6900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	327900000	usd
CY2023	msex	Convertible Preferred Stock ConvertiblePreferredStock	7
CY2023	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	31524000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17732	shares
CY2022	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	28900000	usd
CY2023	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0613	pure
CY2022	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0334	pure
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	42800000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	55500000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.065	pure
CY2022Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0517	pure
CY2023Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	140000000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	42800000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	97200000	usd
CY2023Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	140000000	usd
CY2023Q1	msex	Percentage Of Discount Purchase Of Common Stock In Investment Plan PercentageOfDiscountPurchaseOfCommonStockInInvestmentPlan	0.03	pure
CY2023Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	700000	shares
CY2023Q4	msex	Additional Shares Authorized By Sec To Be Issued AdditionalSharesAuthorizedBySECToBeIssued	700000	shares
CY2023Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1000000	shares
CY2023Q2	msex	Borrowed Loan BorrowedLoan	20000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	7700000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	7600000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	7400000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	7200000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	6900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	327900000	usd
CY2023	msex	Convertible Preferred Stock ConvertiblePreferredStock	7
CY2023	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	31524000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17732	shares
CY2022	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	42429000	usd
CY2022	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	42429000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17597	shares
CY2021	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	36543000	usd
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492	shares
CY2023	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31404000	usd
CY2023Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17732	shares
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	42309000	usd
CY2022Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17597	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	usd
CY2021Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17492	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.77
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.4
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31404000	usd
CY2023Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17732	shares
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	42309000	usd
CY2022Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17597	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	usd
CY2023	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2022	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2021	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2023	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2023Q4	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	115	shares
CY2022	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2022Q4	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	115	shares
CY2021	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	31471000	usd
CY2023	msex	Adjusted Earnings Applicable To Common Stock AdjustedEarningsApplicableToCommonStock	17847	shares
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	42376000	usd
CY2022	msex	Adjusted Earnings Applicable To Common Stock AdjustedEarningsApplicableToCommonStock	17712	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	36490000	usd
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.39
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	133374000	usd
CY2023Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	131745000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	147269000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	138756000	usd
CY2023Q4	us-gaap	Fair Value Option Ineligible Items Aggregate Carrying Amount FairValueOptionIneligibleItemsAggregateCarryingAmount	231300000	usd
CY2022Q4	us-gaap	Fair Value Option Ineligible Items Aggregate Carrying Amount FairValueOptionIneligibleItemsAggregateCarryingAmount	159100000	usd
CY2023Q4	msex	Customer Advances For Construction Work CustomerAdvancesForConstructionWork	21300000	usd
CY2022Q4	msex	Customer Advances For Construction Work CustomerAdvancesForConstructionWork	21400000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	83700000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17597	shares
CY2021	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	36543000	usd
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492	shares
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31404000	usd
CY2023Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17732	shares
CY2022Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17597	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	usd
CY2021Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17492	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.77
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31404000	usd
CY2023Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17732	shares
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	42309000	usd
CY2022Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17597	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	usd
CY2021Q4	msex	Earnings Applicable To Common Stock EarningsApplicableToCommonStock	17492	shares
CY2023	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2022	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2021	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	7
CY2023	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2023Q4	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	115	shares
CY2022	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2022Q4	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	115	shares
CY2021	us-gaap	Convertible Preferred Dividends Net Of Tax ConvertiblePreferredDividendsNetOfTax	67000	usd
CY2021Q4	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	115	shares
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	31471000	usd
CY2023	msex	Adjusted Earnings Applicable To Common Stock AdjustedEarningsApplicableToCommonStock	17847	shares
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	42376000	usd
CY2022	msex	Adjusted Earnings Applicable To Common Stock AdjustedEarningsApplicableToCommonStock	17712	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	36490000	usd
CY2021	msex	Adjusted Earnings Applicable To Common Stock AdjustedEarningsApplicableToCommonStock	17607	shares
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.39
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	133374000	usd
CY2023Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	131745000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	147269000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	138756000	usd
CY2023Q4	us-gaap	Fair Value Option Ineligible Items Aggregate Carrying Amount FairValueOptionIneligibleItemsAggregateCarryingAmount	231300000	usd
CY2022Q4	us-gaap	Fair Value Option Ineligible Items Aggregate Carrying Amount FairValueOptionIneligibleItemsAggregateCarryingAmount	159100000	usd
CY2023Q4	msex	Customer Advances For Construction Work CustomerAdvancesForConstructionWork	21300000	usd
CY2022Q4	msex	Customer Advances For Construction Work CustomerAdvancesForConstructionWork	21400000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	83700000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	79400000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	79400000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.075	pure
CY2023Q4	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years One To Three IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree	0.005	pure
CY2023Q4	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years Four And Five IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive	0.045	pure
CY2023Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.075	pure
CY2023Q4	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years One To Three IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree	0.005	pure
CY2023	msex	Number Of Hours Required To Participate In Contribution Plan NumberOfHoursRequiredToParticipateInContributionPlan	1000	pure
CY2023	msex	Percent Of Participants Contributions Matched By Company Below One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation	1	pure
CY2023	msex	Stock Based Compensation Remain Award Rate StockBasedCompensationRemainAwardRate	0.01	pure
CY2023	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2023	msex	Threshold Percentage Of Participants Compensation At Which Matching Decreases ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases	0.01	pure
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2023	msex	Matching Contributions MatchingContributions	800000	usd
CY2022	msex	Matching Contributions MatchingContributions	700000	usd
CY2023	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	900000	usd
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05	pure
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	900000	usd
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	800000	usd
CY2023Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	300000	shares
CY2023	msex	Percentage Of Shares Available For Issuance PercentageOfSharesAvailableForIssuance	0.75	pure
CY2023	msex	Number Of Hours Required To Participate In Contribution Plan NumberOfHoursRequiredToParticipateInContributionPlan	1000	pure
CY2023	msex	Percent Of Participants Contributions Matched By Company Below One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation	1	pure
CY2023	msex	Stock Based Compensation Remain Award Rate StockBasedCompensationRemainAwardRate	0.01	pure
CY2023	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2023	msex	Threshold Percentage Of Participants Compensation At Which Matching Decreases ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases	0.01	pure
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2023	msex	Matching Contributions MatchingContributions	800000	usd
CY2022	msex	Matching Contributions MatchingContributions	700000	usd
CY2021	msex	Matching Contributions MatchingContributions	700000	usd
CY2023	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	900000	usd
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05	pure
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	900000	usd
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	800000	usd
CY2023Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	300000	shares
CY2023	msex	Percentage Of Shares Available For Issuance PercentageOfSharesAvailableForIssuance	0.75	pure
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segments
CY2023	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	166274000	usd
CY2022	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	162434000	usd
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	39223000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	47333000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	33211000	usd
CY2023	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	25194000	usd
CY2022	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	23029000	usd
CY2021	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	21109000	usd
CY2023	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	6485000	usd
CY2022	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	7703000	usd
CY2021	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	5958000	usd
CY2023	us-gaap	Interest Expense InterestExpense	13143000	usd
CY2022	us-gaap	Interest Expense InterestExpense	9367000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	90179000	usd
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2023Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2022Q1	msex	Operating Revenues OperatingRevenues	36196000	usd
CY2022Q2	msex	Operating Revenues OperatingRevenues	39683000	usd
CY2022Q3	msex	Operating Revenues OperatingRevenues	47732000	usd
CY2022Q4	msex	Operating Revenues OperatingRevenues	38823000	usd
CY2022	msex	Operating Revenues OperatingRevenues	162434000	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segments
CY2023	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	166274000	usd
CY2022	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	162434000	usd
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	39223000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	47333000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	33211000	usd
CY2023	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	25194000	usd
CY2022	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	23029000	usd
CY2023	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	6485000	usd
CY2022	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	7703000	usd
CY2021	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	5958000	usd
CY2023	us-gaap	Interest Expense InterestExpense	13143000	usd
CY2022	us-gaap	Interest Expense InterestExpense	9367000	usd
CY2021	us-gaap	Interest Expense InterestExpense	8114000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1041000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3240000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	31524000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	42429000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	90179000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	91335000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	79378000	usd
CY2023Q4	us-gaap	Assets Assets	1236052000	usd
CY2022Q4	us-gaap	Assets Assets	1074450000	usd
CY2023Q1	msex	Operating Revenues OperatingRevenues	38156000	usd
CY2023Q2	msex	Operating Revenues OperatingRevenues	42801000	usd
CY2023Q3	msex	Operating Revenues OperatingRevenues	46715000	usd
CY2023Q4	msex	Operating Revenues OperatingRevenues	38602000	usd
CY2023	msex	Operating Revenues OperatingRevenues	166274000	usd
CY2023Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	7490000	usd
CY2023Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	10669000	usd
CY2023Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	12822000	usd
CY2023Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	8242000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	39223000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	5868000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	9901000	usd
CY2023Q3	us-gaap	Profit Loss ProfitLoss	9990000	usd
CY2023Q4	us-gaap	Profit Loss ProfitLoss	5765000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	31524000	usd
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2023Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.77
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2023Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	91335000	usd
CY2023Q4	us-gaap	Assets Assets	1236052000	usd
CY2022Q4	us-gaap	Assets Assets	1074450000	usd
CY2023Q1	msex	Operating Revenues OperatingRevenues	38156000	usd
CY2023Q2	msex	Operating Revenues OperatingRevenues	42801000	usd
CY2023Q3	msex	Operating Revenues OperatingRevenues	46715000	usd
CY2023Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	7490000	usd
CY2023Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	10669000	usd
CY2023Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	12822000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	39223000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	5868000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	9901000	usd
CY2023Q3	us-gaap	Profit Loss ProfitLoss	9990000	usd
CY2023Q4	us-gaap	Profit Loss ProfitLoss	5765000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	31524000	usd
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2023Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.77
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2023Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2023Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2023Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2023Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.325
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.2625
CY2022Q1	msex	Operating Revenues OperatingRevenues	36196000	usd
CY2022Q2	msex	Operating Revenues OperatingRevenues	39683000	usd
CY2022Q3	msex	Operating Revenues OperatingRevenues	47732000	usd
CY2022Q4	msex	Operating Revenues OperatingRevenues	38823000	usd
CY2022	msex	Operating Revenues OperatingRevenues	162434000	usd
CY2022Q1	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	5232000	usd
CY2022	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	5232000	usd
CY2022Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	12523000	usd
CY2022Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	10088000	usd
CY2022Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	16575000	usd
CY2022Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	8147000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	47333000	usd
CY2022Q1	us-gaap	Profit Loss ProfitLoss	12100000	usd
CY2022Q2	us-gaap	Profit Loss ProfitLoss	8868000	usd
CY2022Q3	us-gaap	Profit Loss ProfitLoss	14291000	usd
CY2022Q4	us-gaap	Profit Loss ProfitLoss	7170000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	42429000	usd
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2022Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.4
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.4
CY2022Q1	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	5232000	usd
CY2022	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	5232000	usd
CY2022Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	12523000	usd
CY2022Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	16575000	usd
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.5
CY2022Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	8147000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	47333000	usd
CY2022Q1	us-gaap	Profit Loss ProfitLoss	12100000	usd
CY2022Q2	us-gaap	Profit Loss ProfitLoss	8868000	usd
CY2022Q3	us-gaap	Profit Loss ProfitLoss	14291000	usd
CY2022Q4	us-gaap	Profit Loss ProfitLoss	7170000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	42429000	usd
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.5
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2022Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.4
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.4
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.5
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2022Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.4
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.1825
CY2023	dei	Auditor Firm AuditorFirmId	23
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2022Q4	msex	Litigation Settlements Receivable LitigationSettlementsReceivable		usd
CY2022Q4	msex	Litigation Settlement Payable LitigationSettlementPayable		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary		usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment		usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment		usd
CY2021	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts		usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock		usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock		usd
CY2023	msex	Longterm Debt Deobligation LongtermDebtDeobligation		usd
CY2022	msex	Longterm Debt Deobligation LongtermDebtDeobligation		usd
CY2023	msex	Non Cash Consideration For Sale Of Subsidiary NonCashConsiderationForSaleOfSubsidiary		usd
CY2022	msex	Litigation Settlement Receivable LitigationSettlementReceivable		usd
CY2021	msex	Litigation Settlement Receivable LitigationSettlementReceivable		usd
CY2022Q4	msex	Litigation Settlement Payable LitigationSettlementPayable		usd
CY2021Q4	msex	Litigation Settlement Payable LitigationSettlementPayable		usd
CY2023Q4	msex	Common Stock Value Authorized CommonStockValueAuthorized		usd
CY2022Q4	msex	Common Stock Value Authorized CommonStockValueAuthorized		usd
CY2023Q4	msex	Preferred Stock Value Authorized PreferredStockValueAuthorized		usd
CY2022Q4	msex	Preferred Stock Value Authorized PreferredStockValueAuthorized		usd
CY2023Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding		usd
CY2022Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding		usd
CY2023Q4	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount		usd
CY2021Q2	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount		usd
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2022Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.4
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.39
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3125
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.1825
CY2023	dei	Auditor Firm AuditorFirmId	23
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary		usd
CY2021	us-gaap	Gain Or Loss On Sale Of Stock In Subsidiary GainOrLossOnSaleOfStockInSubsidiary		usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment		usd
CY2021	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts		usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock		usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock		usd
CY2023	msex	Longterm Debt Deobligation LongtermDebtDeobligation		usd
CY2022	msex	Longterm Debt Deobligation LongtermDebtDeobligation		usd
CY2023	msex	Non Cash Consideration For Sale Of Subsidiary NonCashConsiderationForSaleOfSubsidiary		usd
CY2021	msex	Non Cash Consideration For Sale Of Subsidiary NonCashConsiderationForSaleOfSubsidiary		usd
CY2022	msex	Litigation Settlement Receivable LitigationSettlementReceivable		usd
CY2021	msex	Litigation Settlement Receivable LitigationSettlementReceivable		usd
CY2022Q4	msex	Litigation Settlement Payable LitigationSettlementPayable		usd
CY2021Q4	msex	Litigation Settlement Payable LitigationSettlementPayable		usd
CY2023Q4	msex	Common Stock Value Authorized CommonStockValueAuthorized		usd
CY2022Q4	msex	Common Stock Value Authorized CommonStockValueAuthorized		usd
CY2023Q4	msex	Preferred Stock Value Authorized PreferredStockValueAuthorized		usd
CY2022Q4	msex	Preferred Stock Value Authorized PreferredStockValueAuthorized		usd
CY2023Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding		usd
CY2022Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding		usd
CY2023Q4	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount		usd
CY2021Q2	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount		usd
CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OperatingLeaseLiability
CY2022Q2	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2022Q3	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2022Q4	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000066004
CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OperatingLeaseLiability
CY2022Q2	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2022Q3	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2022Q4	us-gaap	Gain Loss On Sale Of Stock In Subsidiary Or Equity Method Investee GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee		usd
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000066004

Files In Submission

Name	View Source	Status
0001174947-24-000281-index-headers.html	Edgar Link	pending
0001174947-24-000281-index.html	Edgar Link	pending
0001174947-24-000281.txt	Edgar Link	pending
0001174947-24-000281-xbrl.zip	Edgar Link	pending
ex10-26f.htm	Edgar Link	pending
ex10-27d.htm	Edgar Link	pending
ex10-6.htm	Edgar Link	pending
ex19.htm	Edgar Link	pending
ex21.htm	Edgar Link	pending
ex23-1.htm	Edgar Link	pending
ex31-1.htm	Edgar Link	pending
ex31.htm	Edgar Link	pending
ex32-1.htm	Edgar Link	pending
ex32.htm	Edgar Link	pending
ex97.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
image_001.jpg	Edgar Link	pending
image_002.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
msex-20231231.htm	Edgar Link	pending
msex-20231231.xsd	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
msex-20231231_cal.xml	Edgar Link	unprocessable
msex-20231231_def.xml	Edgar Link	unprocessable
msex-20231231_lab.xml	Edgar Link	unprocessable
msex-20231231_pre.xml	Edgar Link	unprocessable
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
msex-20231231_htm.xml	Edgar Link	completed

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$MSEX
MIDDLESEX WATER CO Stock $msex

2024 Q1 Form 10-K Financial Statement

#000117494724000281 Filed on March 01, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX MIDDLESEX WATER CO Stock $msex

2024 Q1 Form 10-K Financial Statement

#000117494724000281 Filed on March 01, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX
MIDDLESEX WATER CO Stock $msex