$MSEX
MIDDLESEX WATER CO Stock $msex

$msex Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000117494722000283 Filed on February 25, 2022

Income Statement

Concept	2021 Q4	2021 Q3	2021
Revenue	$34.03M	$39.87M	$143.1M
YoY Change	-1.74%	-0.12%	1.09%
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	$9.546M	$4.353M	$26.80M
YoY Change	82.18%	-7.79%	28.61%
% of Gross Profit
Operating Expenses	$27.69M	$28.45M	$109.9M
YoY Change	5.27%	6.38%	5.53%
Operating Profit	$6.339M	$11.42M	$33.21M
YoY Change	-23.91%	-13.3%	-11.25%
Interest Expense	-$2.204M	-$2.101M	$8.114M
YoY Change	11.88%	-210.23%	8.29%
% of Operating Profit	-34.77%	-18.39%	24.43%
Other Income/Expense, Net	$997.0K	$744.0K	$5.958M
YoY Change	184.86%	-46.47%	36.06%
Pretax Income	$5.408M	$10.41M	$31.06M
YoY Change	-19.28%	-17.82%	-9.48%
Income Tax	-$1.830M	-$1.065M	-$5.488M
% Of Pretax Income	-33.84%	-10.23%	-17.67%
Net Earnings	$7.237M	$11.48M	$36.54M
YoY Change	-12.88%	-9.9%	-4.9%
Net Earnings / Revenue	21.27%	28.78%	25.53%
Basic Earnings Per Share	$0.42	$0.65	$2.08
Diluted Earnings Per Share	$0.41	$0.65	$2.07
COMMON SHARES
Basic Shares Outstanding		17.49M shares	17.49M shares
Diluted Shares Outstanding		17.61M shares	17.61M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2021
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.533M	$5.282M	$3.533M
YoY Change	-21.49%	-0.34%	-21.49%
Cash & Equivalents	$3.533M	$5.282M	$3.533M
Short-Term Investments
Other Short-Term Assets	$10.15M	$13.10M	$10.15M
YoY Change	1.53%	7.39%	1.53%
Inventory	$5.358M	$5.156M	$5.358M
Prepaid Expenses	$2.880M
Receivables	$15.31M	$17.03M	$15.31M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$34.36M	$40.57M	$34.36M
YoY Change	0.68%	7.13%	0.75%
LONG-TERM ASSETS
Property, Plant & Equipment	$881.3M	$865.9M	$881.3M
YoY Change	8.4%	10.69%	8.4%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$83.00K	$123.1M	$104.4M
YoY Change	-1.19%	8903.51%	-19.29%
Total Long-Term Assets	$985.7M	$989.0M	$985.7M
YoY Change	4.6%	7.27%	4.59%
TOTAL ASSETS
Total Short-Term Assets	$34.36M	$40.57M	$34.36M
Total Long-Term Assets	$985.7M	$989.0M	$985.7M
Total Assets	$1.020B	$1.030B	$1.020B
YoY Change	4.46%	7.27%	4.46%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$21.13M	$17.34M	$21.13M
YoY Change	-30.61%	-30.25%	-30.51%
Accrued Expenses	$2.786M	$1.994M	$2.786M
YoY Change	-0.5%	-26.15%	-0.5%
Deferred Revenue
YoY Change
Short-Term Debt	$13.00M	$50.00M	$13.00M
YoY Change	550.0%	36.99%	550.0%
Long-Term Debt Due	$6.731M	$6.806M	$6.731M
YoY Change	-7.22%	-5.98%	-7.79%
Total Short-Term Liabilities	$56.62M	$92.49M	$56.62M
YoY Change	-0.4%	8.37%	-0.32%
LONG-TERM LIABILITIES
Long-Term Debt	$306.5M	$266.5M	$306.5M
YoY Change	12.18%	13.64%	12.2%
Other Long-Term Liabilities	$1.086M	$242.8M	$217.6M
YoY Change	-4.32%	9885.36%	-8.12%
Total Long-Term Liabilities	$307.6M	$266.5M	$524.1M
YoY Change	12.11%	12.48%	2.76%
TOTAL LIABILITIES
Total Short-Term Liabilities	$56.62M	$92.49M	$56.62M
Total Long-Term Liabilities	$307.6M	$266.5M	$524.1M
Total Liabilities	$364.2M	$665.2M	$650.2M
YoY Change	9.96%	106.4%	3.5%
SHAREHOLDERS EQUITY
Retained Earnings	$145.8M
YoY Change	13.24%
Common Stock	$221.9M
YoY Change	2.05%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$369.8M	$364.4M	$369.8M
YoY Change
Total Liabilities & Shareholders Equity	$1.020B	$1.030B	$1.020B
YoY Change	4.46%	7.27%	4.46%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021
OPERATING ACTIVITIES
Net Income	$7.237M	$11.48M	$36.54M
YoY Change	-12.88%	-9.9%	-4.9%
Depreciation, Depletion And Amortization	$9.546M	$4.353M	$26.80M
YoY Change	82.18%	-7.79%	28.61%
Cash From Operating Activities	$14.39M	$4.059M	$33.03M
YoY Change	-10.45%	-75.36%	-38.1%
INVESTING ACTIVITIES
Capital Expenditures	-$18.13M	$14.75M	-$79.38M
YoY Change	-47.94%	-41.87%	-24.85%
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$18.13M	-$14.74M	-$79.38M
YoY Change	-47.94%	-41.88%	-24.84%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$3.837M
YoY Change			211.95%
Debt Paid & Issued, Net			$52.69M
YoY Change			605.18%
Cash From Financing Activities	1.994M	9.781M	$39.48M
YoY Change	101.41%	-293.68%	144.16%
NET CHANGE
Cash From Operating Activities	14.39M	4.059M	$33.03M
Cash From Investing Activities	-18.13M	-14.74M	-$79.38M
Cash From Financing Activities	1.994M	9.781M	$39.48M
Net Change In Cash	-1.749M	-905.0K	-$6.871M
YoY Change	-90.16%	-93.51%	-80.96%
FREE CASH FLOW
Cash From Operating Activities	$14.39M	$4.059M	$33.03M
Capital Expenditures	-$18.13M	$14.75M	-$79.38M
Free Cash Flow	$32.52M	-$10.69M	$112.4M
YoY Change	-36.1%	20.11%	-29.29%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000066004
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	0-422
CY2021	dei	Entity Registrant Name EntityRegistrantName	MIDDLESEX WATER COMPANY
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NJ
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	22-1114430
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	485C Route 1 South
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 400
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Iselin
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	08830
CY2021	dei	City Area Code CityAreaCode	732
CY2021	dei	Local Phone Number LocalPhoneNumber	634-1500
CY2021	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
CY2021	dei	Trading Symbol TradingSymbol	MSEX
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	1392996885	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17535572	shares
CY2021	dei	Auditor Name AuditorName	Baker Tilly US, LLP
CY2021	dei	Auditor Location AuditorLocation	Philadelphia, PA
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	USD
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2021	msex	Operations And Maintenance OperationsAndMaintenance	73671000	USD
CY2020	msex	Operations And Maintenance OperationsAndMaintenance	70796000	USD
CY2019	msex	Operations And Maintenance OperationsAndMaintenance	67980000	USD
CY2021	us-gaap	Depreciation Depreciation	21109000	USD
CY2020	us-gaap	Depreciation Depreciation	18472000	USD
CY2019	us-gaap	Depreciation Depreciation	16716000	USD
CY2021	us-gaap	Taxes Other TaxesOther	15150000	USD
CY2020	us-gaap	Taxes Other TaxesOther	14904000	USD
CY2019	us-gaap	Taxes Other TaxesOther	14382000	USD
CY2021	us-gaap	Operating Expenses OperatingExpenses	109930000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	104172000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	99078000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2653000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3305000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	363000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-654000	USD
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	5958000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4379000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	2492000	USD
CY2021	us-gaap	Interest Expense InterestExpense	8114000	USD
CY2020	us-gaap	Interest Expense InterestExpense	7493000	USD
CY2019	us-gaap	Interest Expense InterestExpense	7264000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31055000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	34306000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	30748000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	132000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	118144000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38305000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.18
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17459000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17607000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17574000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16829000	shares
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	247286000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	168080000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	697200000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	648763000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	95658000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	85056000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	24947000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	80055000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1065091000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	981954000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	199723000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	185356000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	865368000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	796598000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3533000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4491000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2574000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2053000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	15311000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	14569000	USD
CY2021Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	7273000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	7065000	USD
CY2021Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	5358000	USD
CY2020Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	5112000	USD
CY2021Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	2880000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	2886000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	34355000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	34123000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4503000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5209000	USD
CY2021Q4	msex	Preliminary Survey And Investigation Charges PreliminarySurveyAndInvestigationCharges	3540000	USD
CY2020Q4	msex	Preliminary Survey And Investigation Charges PreliminarySurveyAndInvestigationCharges	5192000	USD
CY2021Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	100738000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent		USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	5913000	USD
CY2021Q4	msex	Non Utility Assets Net NonUtilityAssetsNet	11428000	USD
CY2020Q4	msex	Non Utility Assets Net NonUtilityAssetsNet	11207000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	83000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	84000	USD
CY2021Q4	msex	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	120292000	USD
CY2020Q4	msex	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	145749000	USD
CY2021Q4	us-gaap	Assets Assets	1020015000	USD
CY2020Q4	us-gaap	Assets Assets	976470000	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	221919000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	217451000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	145807000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	128757000	USD
CY2021Q4	msex	Total Common Equity TotalCommonEquity	367726000	USD
CY2020Q4	msex	Total Common Equity TotalCommonEquity	346208000	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	306520000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	273244000	USD
CY2021Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	676330000	USD
CY2020Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	621536000	USD
CY2021Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	6731000	USD
CY2020Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	7255000	USD
CY2021Q4	us-gaap	Notes Payable Current NotesPayableCurrent	13000000	USD
CY2020Q4	us-gaap	Notes Payable Current NotesPayableCurrent	2000000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	21125000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	30443000	USD
CY2021Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	8621000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	10138000	USD
CY2021Q4	us-gaap	Interest Payable Current InterestPayableCurrent	1986000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2137000	USD
CY2021Q4	msex	Unearned Revenues And Advanced Service Fees UnearnedRevenuesAndAdvancedServiceFees	1330000	USD
CY2020Q4	msex	Unearned Revenues And Advanced Service Fees UnearnedRevenuesAndAdvancedServiceFees	1255000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	3826000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	3620000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	56619000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	56848000	USD
CY2021Q4	msex	Construction Advances ConstructionAdvances	23529000	USD
CY2020Q4	msex	Construction Advances ConstructionAdvances	23404000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	4367000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	5042000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	69500000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	61297000	USD
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	11290000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	34426000	USD
CY2021Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	49431000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	60792000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1086000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1135000	USD
CY2021Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	159203000	USD
CY2020Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	186096000	USD
CY2021Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	127863000	USD
CY2020Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	111990000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1020015000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	976470000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	26799000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	20838000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	17232000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-10989000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-13490000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-11719000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1505000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2503000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1997000	USD
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	136000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	391000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	252000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	1338000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	1096000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	637000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	742000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2661000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	146000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	208000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-118000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-110000	USD
CY2021	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	246000	USD
CY2020	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	-333000	USD
CY2019	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	34000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-6000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	519000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-277000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-9318000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	7137000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3981000	USD
CY2021	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-1517000	USD
CY2020	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	2503000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-6595000	USD
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-151000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	106000	USD
CY2021	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-2645000	USD
CY2021	msex	Change In Deferred Revenue ChangeInDeferredRevenue	75000	USD
CY2020	msex	Change In Deferred Revenue ChangeInDeferredRevenue	44000	USD
CY2019	msex	Change In Deferred Revenue ChangeInDeferredRevenue	175000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-3696000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-866000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	33028000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	53355000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	36053000	USD
CY2021	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	1148000	USD
CY2020	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	1513000	USD
CY2019	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	1149000	USD
CY2021	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	79378000	USD
CY2020	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	105619000	USD
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	89125000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-79378000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-105619000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-89125000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	52691000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7472000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7343000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	86595000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	50316000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	78967000	USD
CY2021	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt		USD
CY2020	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt		USD
CY2019	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt	7083000	USD
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	11000000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-18000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-28500000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	994000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	148000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	769000	USD
CY2021	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts		USD
CY2020	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	37000	USD
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	357000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3837000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1230000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	56784000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19373000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18178000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16165000	USD
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	120000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	120000	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	132000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	11225000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	8578000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	4342000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	39479000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	16169000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	93910000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6871000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-36095000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	40838000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10404000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	46499000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5661000	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
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	46499000	USD
CY2021	us-gaap	Contribution Of Property ContributionOfProperty	4750000	USD
CY2020	us-gaap	Contribution Of Property ContributionOfProperty	5080000	USD
CY2019	us-gaap	Contribution Of Property ContributionOfProperty	7770000	USD
CY2021	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	64000	USD
CY2020	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	258000	USD
CY2019	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	130000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	8546000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	7644000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	6938000	USD
CY2021	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1148000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1513000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1149000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3335000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2509000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10339000	USD
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17522000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17473000	shares
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	221919000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	217451000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	145807000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	128757000	USD
CY2021Q4	msex	Total Common Equity TotalCommonEquity	367726000	USD
CY2020Q4	msex	Total Common Equity TotalCommonEquity	346208000	USD
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	311146000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	277241000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	7271000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	7669000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5166000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4411000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	6731000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7255000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	306520000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	273244000	USD
CY2018Q4	msex	Total Common Equity TotalCommonEquity	248787000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	12738000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	196000	USD
CY2019	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	466000	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	350000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	44046000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.976
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16165000	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	132000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	357000	USD
CY2019Q4	msex	Total Common Equity TotalCommonEquity	323792000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1230000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	245000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.041
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	18178000	USD
CY2020	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	37000	USD
CY2020Q4	msex	Total Common Equity TotalCommonEquity	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 Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	281000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.108
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19373000	USD
CY2021	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	120000	USD
CY2021Q4	msex	Total Common Equity TotalCommonEquity	367726000	USD
CY2021	us-gaap	Nature Of Operations NatureOfOperations	<p style="font-family:Times New Roman, Times, serif; font-size:10pt; text-align:justify; margin-top:11pt; margin-bottom:0pt; "> <span style="font-weight:bold; ">(a) Organization</span> - Middlesex Water Company (Middlesex) is the parent company and sole shareholder of Tidewater Utilities, Inc. (Tidewater), Pinelands Water Company (Pinelands Water) and Pinelands Wastewater Company (Pinelands Wastewater) (collectively, Pinelands), Utility Service Affiliates, Inc. (USA), Utility Service Affiliates (Perth Amboy) Inc. (USA-PA) and Twin Lakes Utilities, Inc. (Twin Lakes). Southern Shores Water Company, LLC (Southern Shores) and White Marsh Environmental Systems, Inc. (White Marsh) are wholly-owned subsidiaries of Tidewater. On January 14, 2022, Middlesex closed on the sale of its entire interest in Tidewater Environmental Systems, Inc. (TESI), which was its regulated Delaware wastewater utility business. </p> <p style="font-family:Times New Roman, Times, serif; font-size:10pt; text-align:justify; margin-top:11pt; margin-bottom:0pt; ">Middlesex Water Company has operated as a water utility in New Jersey since 1897 and in Delaware, through our wholly-owned subsidiary, Tidewater, since 1992. We are in the business of collecting, treating, distributing and selling water for domestic, commercial, municipal, industrial and fire protection purposes. We also operate New Jersey municipal water, wastewater and storm water systems under contract and provide unregulated water and wastewater services in New Jersey and Delaware through our subsidiaries. Our rates charged to customers for water and wastewater services, the quality of services we provide and certain other matters are regulated in New Jersey and Delaware by the New Jersey Board of Public Utilities (NJBPU) and the Delaware Public Service Commission (DEPSC), respectively. Our USA, USA-PA and White Marsh subsidiaries are not regulated utilities. </p>
CY2021	msex	Percent Voting Interest PercentVotingInterest	0.50	pure
CY2021	msex	Percent Of Operating Revenues PercentOfOperatingRevenues	0.91	pure
CY2021	msex	Percent Of Total Assets PercentOfTotalAssets	0.99	pure
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2600000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2100000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	900000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000.0	USD
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	400000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	500000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	600000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2021	msex	Residential Operating Revenues ResidentialOperatingRevenues	77699000	USD
CY2020	msex	Residential Operating Revenues ResidentialOperatingRevenues	76798000	USD
CY2019	msex	Residential Operating Revenues ResidentialOperatingRevenues	71487000	USD
CY2021	msex	Commercial Operating Revenues CommercialOperatingRevenues	16715000	USD
CY2020	msex	Commercial Operating Revenues CommercialOperatingRevenues	15448000	USD
CY2019	msex	Commercial Operating Revenues CommercialOperatingRevenues	15198000	USD
CY2021	msex	Industrial Operating Revenues IndustrialOperatingRevenues	8990000	USD
CY2020	msex	Industrial Operating Revenues IndustrialOperatingRevenues	9512000	USD
CY2019	msex	Industrial Operating Revenues IndustrialOperatingRevenues	9390000	USD
CY2021	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12608000	USD
CY2020	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12374000	USD
CY2019	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12291000	USD
CY2021	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14590000	USD
CY2020	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	15187000	USD
CY2019	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14319000	USD
CY2021	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	12391000	USD
CY2020	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	12130000	USD
CY2019	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	11773000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	142993000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	141449000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	134458000	USD
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	929000	USD
CY2020	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	532000	USD
CY2019	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	393000	USD
CY2021	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	427000	USD
CY2020	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	415000	USD
CY2019	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	404000	USD
CY2021	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-1208000	USD
CY2020	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-804000	USD
CY2019	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-657000	USD
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	USD
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman, Times, serif; font-size:10pt; text-align:justify; margin-top:11pt; margin-bottom:0pt; "> <span style="font-weight:bold; ">(q) Use of Estimates</span> - 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>
CY2019Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.0335	pure
CY2021Q4	us-gaap	Regulatory Assets RegulatoryAssets	100738000	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	118144000	USD
CY2021Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	30400000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	31000000.0	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6521000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7204000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6457000	USD
CY2021	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1290000	USD
CY2020	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1356000	USD
CY2019	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-802000	USD
CY2021	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-12281000	USD
CY2020	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-11298000	USD
CY2019	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-10156000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1499000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1364000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1173000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	63000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-33000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	188000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-8247000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4281000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3822000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1467000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2598000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2246000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	933000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1490000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-726000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	431000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-871000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-761000	USD
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-72000	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-75000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-77000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2021Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	65107000	USD
CY2020Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	56868000	USD
CY2021Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3595000	USD
CY2020Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3626000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7091000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7339000	USD
CY2021Q4	msex	Right Of Use Assets Accumulated Amortization RightOfUseAssetsAccumulatedAmortization	2800000	USD
CY2020Q4	msex	Right Of Use Assets Accumulated Amortization RightOfUseAssetsAccumulatedAmortization	2100000	USD
CY2021Q4	msex	Right Of Use Assets Current RightOfUseAssetsCurrent	4500000	USD
CY2020Q4	msex	Right Of Use Assets Current RightOfUseAssetsCurrent	5200000	USD
CY2021Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	373000	USD
CY2020Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	445000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-524000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-271000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	69500000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	61297000	USD
CY2021	msex	Cost Of Untreated Water CostOfUntreatedWater	3300000	USD
CY2020	msex	Cost Of Untreated Water CostOfUntreatedWater	3400000	USD
CY2019	msex	Cost Of Untreated Water CostOfUntreatedWater	3400000	USD
CY2021	msex	Cost Of Treated Water CostOfTreatedWater	3600000	USD
CY2020	msex	Cost Of Treated Water CostOfTreatedWater	3600000	USD
CY2019	msex	Cost Of Treated Water CostOfTreatedWater	3200000	USD
CY2021	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6900000	USD
CY2020	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	7000000.0	USD
CY2019	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6600000	USD
CY2021	msex	Lease Maturity Date LeaseMaturityDate	2030
CY2021Q4	msex	Estimated Incremental Borrowing Rate EstimatedIncrementalBorrowingRate	0.0403	pure
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	USD
CY2020	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	800000	USD
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	700000	USD
CY2021Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	USD
CY2020Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	2900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	7000000.0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1800000	USD
CY2021Q4	msex	Operating Lease Liability1 OperatingLeaseLiability1	5200000	USD
CY2021Q4	msex	Operating Lease Liability Current1 OperatingLeaseLiabilityCurrent1	-800000	USD
CY2021Q4	msex	Noncurrent Lease Liability NoncurrentLeaseLiability	4400000	USD
CY2021	msex	Budgeted Construction Cost BudgetedConstructionCost	88000000	USD
CY2021	msex	Budgeted Construction Cost For Construction Program Year One BudgetedConstructionCostForConstructionProgramYearOne	83000000	USD
CY2021	msex	Budgeted Construction Cost For Construction Program Year Two BudgetedConstructionCostForConstructionProgramYearTwo	58000000	USD
CY2021	msex	Estimated Obligation Expend EstimatedObligationExpend	34000000	USD
CY2021	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	23700000	USD
CY2020	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	28300000	USD
CY2021	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0112	pure
CY2020	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0155	pure
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	13000000.0	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2000000.0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0104	pure
CY2020Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0104	pure
CY2021Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	110000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	140000000.0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	13000000.0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	97000000.0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	110000000.0	USD
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	60000000.0	USD
CY2021Q4	msex	Increase Line Of Credit IncreaseLineOfCredit	140000000.0	USD
CY2021Q4	msex	Additional Shares Authorized By Sec To Be Issued AdditionalSharesAuthorizedBySECToBeIssued	300000	shares
CY2019Q4	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	800000	shares
CY2019Q4	us-gaap	Share Price SharePrice	60.50
CY2019Q4	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	43700000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	6000000.0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	5600000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	5400000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	6700000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	16100000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492000	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17459000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	132000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492000	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38305000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17459000	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36423000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17492000	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38305000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17459000	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2021	msex	Convertible Dollar7 Preferred Series Stock Dividends ConvertibleDollar7PreferredSeriesStockDividends	67000	USD
CY2021	msex	Incremental Common Shares Attributable To Conversion Of Dollar7 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	115000	shares
CY2020	msex	Convertible Dollar7 Preferred Series Stock Dividends ConvertibleDollar7PreferredSeriesStockDividends	67000	USD
CY2020	msex	Incremental Common Shares Attributable To Conversion Of Dollar7 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	115000	shares
CY2019	msex	Convertible Dollar7 Preferred Series Stock Dividends ConvertibleDollar7PreferredSeriesStockDividends	67000	USD
CY2019	msex	Incremental Common Shares Attributable To Conversion Of Dollar7 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	115000	shares
CY2021	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends		USD
CY2021	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock		shares
CY2020	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends		USD
CY2020	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock		shares
CY2019	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends	12000	USD
CY2019	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	29000	shares
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	36490000	USD
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17607000	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	38372000	USD
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17574000	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	33835000	USD
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16829000	shares
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.18
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2021Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	212300000	USD
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	129600000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	100400000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	101700000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.075	pure
CY2021	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years One To Three IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree	0.005	pure
CY2021	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years Four And Five IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive	0.045	pure
CY2021	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	21109000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	18472000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	16716000	USD
CY2021	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	5958000	USD
CY2020	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	4379000	USD
CY2019	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	2492000	USD
CY2021	msex	Number Of Hours Required To Participate In Contribution Plan NumberOfHoursRequiredToParticipateInContributionPlan	1000	pure
CY2021	msex	Percent Of Participants Contributions Matched By Company Below One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation	1	pure
CY2021	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2021	msex	Threshold Percentage Of Participants Compensation At Which Matching Decreases ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases	0.01	pure
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2020	msex	Matching Contributions MatchingContributions	700000	USD
CY2019	msex	Matching Contributions MatchingContributions	700000	USD
CY2021	msex	Matching Contributions MatchingContributions	700000	USD
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	800000	USD
CY2021	msex	Defined Contribution Plan Employer Discretionary Contribution Percent DefinedContributionPlanEmployerDiscretionaryContributionPercent	0.050	pure
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	700000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	700000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	300000	shares
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	USD
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	33211000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	37420000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2021	us-gaap	Interest Expense InterestExpense	8114000	USD
CY2020	us-gaap	Interest Expense InterestExpense	7493000	USD
CY2019	us-gaap	Interest Expense InterestExpense	7264000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5488000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2021	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	79378000	USD
CY2020	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	105619000	USD
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	89125000	USD
CY2021Q4	us-gaap	Assets Assets	1020015000	USD
CY2020Q4	us-gaap	Assets Assets	976470000	USD
CY2021Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	32541000	USD
CY2021Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	36701000	USD
CY2021Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	39874000	USD
CY2021Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	34025000	USD
CY2021	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	143141000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	5634000	USD
CY2021Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	9814000	USD
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	11424000	USD
CY2021Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	6339000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	33211000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	6907000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	10923000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	11476000	USD
CY2021Q4	us-gaap	Net Income Loss NetIncomeLoss	7237000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	36543000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2021Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2021Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2725
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2725
CY2021Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2725
CY2021Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2900
CY2021Q1	msex	High Common Stock Price1 HighCommonStockPrice1	85.92
CY2021Q1	msex	Low Common Stock Price1 LowCommonStockPrice1	67.09
CY2021Q2	msex	High Common Stock Price1 HighCommonStockPrice1	88.61
CY2021Q2	msex	Low Common Stock Price1 LowCommonStockPrice1	77.31
CY2021Q3	msex	High Common Stock Price1 HighCommonStockPrice1	116.40
CY2021Q3	msex	Low Common Stock Price1 LowCommonStockPrice1	81.02
CY2021Q4	msex	High Common Stock Price1 HighCommonStockPrice1	119.37
CY2021Q4	msex	Low Common Stock Price1 LowCommonStockPrice1	98.12
CY2020Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	31769000	USD
CY2020Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	35277000	USD
CY2020Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	39920000	USD
CY2020Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	34626000	USD
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	6527000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	9385000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	13177000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	8331000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	37420000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	7668000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	9713000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	12737000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	8307000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.18
CY2020Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2563
CY2020Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2563
CY2020Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2563
CY2020Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2725
CY2020Q1	msex	High Common Stock Price1 HighCommonStockPrice1	69.92
CY2020Q1	msex	Low Common Stock Price1 LowCommonStockPrice1	48.79
CY2020Q2	msex	High Common Stock Price1 HighCommonStockPrice1	72.41
CY2020Q2	msex	Low Common Stock Price1 LowCommonStockPrice1	53.70
CY2020Q3	msex	High Common Stock Price1 HighCommonStockPrice1	69.89
CY2020Q3	msex	Low Common Stock Price1 LowCommonStockPrice1	59.61
CY2020Q4	msex	High Common Stock Price1 HighCommonStockPrice1	76.08
CY2020Q4	msex	Low Common Stock Price1 LowCommonStockPrice1	61.81
CY2021	dei	Auditor Firm AuditorFirmId	23

Files In Submission

Name	View Source	Status
0001174947-22-000283-index-headers.html	Edgar Link	pending
0001174947-22-000283-index.html	Edgar Link	pending
0001174947-22-000283.txt	Edgar Link	pending
0001174947-22-000283-xbrl.zip	Edgar Link	pending
ex10-26a_001.jpg	Edgar Link	pending
ex10-26_001.jpg	Edgar Link	pending
ex10-46_001.jpg	Edgar Link	pending
ex10-7b_001.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
item5chart2.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
msex-20211231.xsd	Edgar Link	pending
msex-20211231_cal.xml	Edgar Link	unprocessable
msex-20211231_def.xml	Edgar Link	unprocessable
msex-20211231_lab.xml	Edgar Link	unprocessable
msex-20211231_pre.xml	Edgar Link	unprocessable
msex10k2021.htm	Edgar Link	pending
msex10k2021_htm.xml	Edgar Link	completed
msex10kex10-26a.htm	Edgar Link	pending
msex10kex10-26b.htm	Edgar Link	pending
msex10kex10-27b.htm	Edgar Link	pending
msex10kex10-46.htm	Edgar Link	pending
msex10kex10-47.htm	Edgar Link	pending
msex10kex21.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$MSEX
MIDDLESEX WATER CO Stock $msex

2021 Q4 Form 10-K Financial Statement

#000117494722000283 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX MIDDLESEX WATER CO Stock $msex

2021 Q4 Form 10-K Financial Statement

#000117494722000283 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX
MIDDLESEX WATER CO Stock $msex