$MSEX
MIDDLESEX WATER CO Stock $msex

$msex Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000117494721000198 Filed on February 25, 2021

Income Statement

Concept	2020	2019 Q4	2019 Q3
Revenue	$141.6M	$32.74M	$37.77M
YoY Change	5.2%	-1.59%	-2.44%
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	$20.84M	$4.370M	$4.246M
YoY Change	20.93%	8.17%	7.49%
% of Gross Profit
Operating Expenses	$104.2M	$25.18M	$25.79M
YoY Change	5.14%	-3.6%	-0.04%
Operating Profit	$37.42M	$7.559M	$11.98M
YoY Change	5.35%	5.68%	-7.24%
Interest Expense	$7.493M	-$2.280M	$1.996M
YoY Change	3.15%	24.59%	-216.05%
% of Operating Profit	20.02%	-30.16%	16.66%
Other Income/Expense, Net	$4.379M	$610.0K	$867.0K
YoY Change	75.72%	-32.97%	4.46%
Pretax Income	$34.31M	$5.880M	$10.85M
YoY Change	11.57%	-5.62%	-9.78%
Income Tax	-$4.119M	-$2.190M	-$265.0K
% Of Pretax Income	-12.01%	-37.24%	-2.44%
Net Earnings	$38.43M	$8.071M	$11.12M
YoY Change	13.39%	15.42%	-9.53%
Net Earnings / Revenue	27.14%	24.65%	29.44%
Basic Earnings Per Share	$2.19	$0.46	$0.67
Diluted Earnings Per Share	$2.18	$0.46	$0.67
COMMON SHARES
Basic Shares Outstanding	17.46M shares		16.61M shares
Diluted Shares Outstanding	17.57M shares		16.76M shares

Balance Sheet

Concept	2020	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.500M	$2.200M	$3.200M
YoY Change	104.55%	-40.54%	-11.11%
Cash & Equivalents	$4.500M	$2.230M	$3.200M
Short-Term Investments
Other Short-Term Assets	$10.00M	$9.600M	$13.00M
YoY Change	4.17%	-3.03%	3.17%
Inventory	$5.100M	$5.400M	$5.200M
Prepaid Expenses		$2.367M
Receivables	$14.60M	$11.91M	$13.40M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$34.10M	$29.13M	$34.70M
YoY Change	17.18%	-5.41%	-1.98%
LONG-TERM ASSETS
Property, Plant & Equipment	$813.0M	$722.0M	$694.2M
YoY Change	12.6%	14.88%	14.05%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$129.3M	$1.899M	$158.5M
YoY Change	-18.53%	-98.25%	46.49%
Total Long-Term Assets	$942.4M	$880.7M	$852.7M
YoY Change	6.99%	19.5%	18.86%
TOTAL ASSETS
Total Short-Term Assets	$34.10M	$29.13M	$34.70M
Total Long-Term Assets	$942.4M	$880.7M	$852.7M
Total Assets	$976.5M	$909.9M	$887.4M
YoY Change	7.32%	18.5%	17.88%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$30.40M	$23.31M	$20.20M
YoY Change	30.47%	20.76%	3.59%
Accrued Expenses	$2.800M	$2.700M	$1.500M
YoY Change	3.7%	107.69%	200.0%
Deferred Revenue
YoY Change
Short-Term Debt	$2.000M	$20.00M	$58.50M
YoY Change	-90.0%	-58.76%	20.62%
Long-Term Debt Due	$7.300M	$7.178M	$7.200M
YoY Change	1.39%	-2.25%	-1.37%
Total Short-Term Liabilities	$56.80M	$64.98M	$103.5M
YoY Change	-12.62%	-31.16%	9.64%
LONG-TERM LIABILITIES
Long-Term Debt	$273.2M	$230.8M	$228.3M
YoY Change	18.37%	50.98%	61.8%
Other Long-Term Liabilities	$236.8M	$2.546M	$226.8M
YoY Change	1.28%	-98.85%	1.3%
Total Long-Term Liabilities	$510.0M	$233.3M	$455.1M
YoY Change	9.77%	52.65%	24.68%
TOTAL LIABILITIES
Total Short-Term Liabilities	$56.80M	$64.98M	$103.5M
Total Long-Term Liabilities	$510.0M	$233.3M	$455.1M
Total Liabilities	$628.2M	$298.3M	$609.5M
YoY Change	7.57%	-42.26%	20.65%
SHAREHOLDERS EQUITY
Retained Earnings		$108.7M
YoY Change		18.85%
Common Stock		$215.1M
YoY Change		36.71%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$348.3M	$325.9M	$277.9M
YoY Change
Total Liabilities & Shareholders Equity	$976.5M	$909.9M	$887.4M
YoY Change	7.32%	18.5%	17.88%

Cashflow Statement

Concept	2020	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	$38.43M	$8.071M	$11.12M
YoY Change	13.39%	15.42%	-9.53%
Depreciation, Depletion And Amortization	$20.84M	$4.370M	$4.246M
YoY Change	20.93%	8.17%	7.49%
Cash From Operating Activities	$53.36M	$12.70M	$11.73M
YoY Change	47.99%	-2.31%	-14.0%
INVESTING ACTIVITIES
Capital Expenditures	-$105.6M	-$27.91M	$25.52M
YoY Change	18.5%	23.66%	-220.73%
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$105.6M	-$27.91M	-$25.52M
YoY Change	18.51%	23.66%	20.72%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$1.230M
YoY Change	-97.83%
Debt Paid & Issued, Net	$7.472M
YoY Change	1.76%
Cash From Financing Activities	$16.17M	4.620M	66.71M
YoY Change	-82.78%	-52.37%	826.53%
NET CHANGE
Cash From Operating Activities	$53.36M	12.70M	11.73M
Cash From Investing Activities	-$105.6M	-27.91M	-25.52M
Cash From Financing Activities	$16.17M	4.620M	66.71M
Net Change In Cash	-$36.10M	-10.59M	52.92M
YoY Change	-188.39%	-8246.15%	-17740.0%
FREE CASH FLOW
Cash From Operating Activities	$53.36M	$12.70M	$11.73M
Capital Expenditures	-$105.6M	-$27.91M	$25.52M
Free Cash Flow	$159.0M	$40.61M	-$13.79M
YoY Change	26.99%	14.17%	-139.65%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	22-1114430
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	0-422
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Entity Registrant Name EntityRegistrantName	MIDDLESEX WATER COMPANY
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3146000	USD
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000066004
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17474598	shares
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	37142000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	1362000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1630000	USD
CY2020	us-gaap	Depreciation Depreciation	18472000	USD
CY2019	us-gaap	Taxes Other TaxesOther	14382000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	104172000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	99078000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	100935000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	37420000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NJ
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	485C Route 1 South
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2589000	USD
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CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	4016000	USD
CY2020	msex	Residential Operating Revenues ResidentialOperatingRevenues	76798000	USD
CY2019	msex	Residential Operating Revenues ResidentialOperatingRevenues	71487000	USD
CY2018	msex	Residential Operating Revenues ResidentialOperatingRevenues	69785000	USD
CY2019	msex	Commercial Operating Revenues CommercialOperatingRevenues	15198000	USD
CY2020	us-gaap	Taxes Other TaxesOther	14904000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	742000	USD
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CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	196000	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
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 400
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Iselin
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	08830
CY2020	dei	City Area Code CityAreaCode	732
CY2020	dei	Local Phone Number LocalPhoneNumber	634-1500
CY2020	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019	us-gaap	Depreciation Depreciation	16716000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	363000	USD
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CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	34306000	USD
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CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
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CY2020	dei	Trading Symbol TradingSymbol	MSEX
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	1096000	USD
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CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	146000	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
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
CY2020	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	519000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-277000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	7137000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3981000	USD
CY2020	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	2503000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	106000	USD
CY2020	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-1377000	USD
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	89125000	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
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7472000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7343000	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
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-18000000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	148000	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
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6397000	USD
CY2019Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	190414000	USD
CY2019Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	97830000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	909878000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	17232000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	15780000	USD
CY2019Q4	msex	Total Common Equity TotalCommonEquity	323792000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	230777000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	556653000	USD
CY2019Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	7178000	USD
CY2019Q4	us-gaap	Notes Payable Current NotesPayableCurrent	20000000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	30443000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	23306000	USD
CY2019Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	7635000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2031000	USD
CY2019Q4	msex	Unearned Revenues And Advanced Service Fees UnearnedRevenuesAndAdvancedServiceFees	1211000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	3620000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	64981000	USD
CY2019Q4	msex	Construction Advances ConstructionAdvances	23905000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	5732000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	61297000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	54408000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	34671000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	69152000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2546000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-8724000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	919000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-27000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	1084000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	977000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	294000	USD
CY2018	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	1293000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	236000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5396000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-6595000	USD
CY2018	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-2114000	USD
CY2020	msex	Change In Deferred Revenue ChangeInDeferredRevenue	44000	USD
CY2019	msex	Change In Deferred Revenue ChangeInDeferredRevenue	175000	USD
CY2018	msex	Change In Deferred Revenue ChangeInDeferredRevenue	85000	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
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	53355000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	45864000	USD
CY2018	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	443000	USD
CY2018	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	72094000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-72094000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7024000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	22076000	USD
CY2020	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt		USD
CY2019	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt	7083000	USD
CY2018	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt		USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-28500000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	20500000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	769000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	880000	USD
CY2020	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	37000	USD
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	357000	USD
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts		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
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1150000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18178000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16165000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14930000	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
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	144000	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
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	4746000	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
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25494000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-36095000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	40838000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-736000	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
CY2020	us-gaap	Contribution Of Property ContributionOfProperty	5080000	USD
CY2019	us-gaap	Contribution Of Property ContributionOfProperty	7770000	USD
CY2018	us-gaap	Contribution Of Property ContributionOfProperty	3835000	USD
CY2020	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	258000	USD
CY2019	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	130000	USD
CY2018	msex	Deobligated Principal Payments DeobligatedPrincipalPayments		USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	7644000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	6938000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	6113000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1513000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1149000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	443000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2509000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10339000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4689000	USD
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17473000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17434000	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	217451000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	215125000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	128757000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	108667000	USD
CY2020Q4	msex	Total Common Equity TotalCommonEquity	346208000	USD
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	277241000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	234397000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	7669000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	8064000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4411000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4506000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7255000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7178000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	273244000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	230777000	USD
CY2017Q4	msex	Total Common Equity TotalCommonEquity	229175000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1150000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	975000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	147000	USD
CY2018	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	38000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.911
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14930000	USD
CY2018	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	144000	USD
CY2018Q4	msex	Total Common Equity TotalCommonEquity	248787000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	12738000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	907000	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	msex	Preferred Stock Convertible Conversion Price PreferredStockConvertibleConversionPrice	8.00
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 Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	851000	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
CY2020	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), Tidewater Environmental Services, Inc. (TESI), 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. </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, Delaware and Pennsylvania by the New Jersey Board of Public Utilities (NJBPU), Delaware Public Service Commission (DEPSC) and Pennsylvania Public Utilities Commission (PAPUC), respectively. Our USA, USA-PA and White Marsh subsidiaries are not regulated utilities. </p>
CY2020	msex	Percent Voting Interest PercentVotingInterest	0.50	pure
CY2020	msex	Percent Of Operating Revenues PercentOfOperatingRevenues	0.91	pure
CY2020	msex	Percent Of Total Assets PercentOfTotalAssets	0.99	pure
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1400000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000.0	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	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
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	700000	USD
CY2020	msex	Commercial Operating Revenues CommercialOperatingRevenues	15448000	USD
CY2020	msex	Industrial Operating Revenues IndustrialOperatingRevenues	9512000	USD
CY2018	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12099000	USD
CY2019	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14319000	USD
CY2018	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14655000	USD
CY2018	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	16374000	USD
CY2020	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	415000	USD
CY2020	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-804000	USD
CY2019	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-657000	USD
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	138077000	USD
CY2020	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>
CY2020	msex	Adoption Of Right Of Use Asset AdoptionOfRightOfUseAsset	6700000	USD
CY2020	msex	Adoption Of Lease Liability AdoptionOfLeaseLiability	7100000	USD
CY2020Q4	us-gaap	Amount Of Embedded Regulatory Asset AmountOfEmbeddedRegulatoryAsset	400000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1173000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1207000	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
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	49000	USD
CY2019Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.0335	pure
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	118144000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	110479000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	31000000.0	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	31500000	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
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7009000	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
CY2018	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	422000	USD
CY2020	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-11298000	USD
CY2019	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-10156000	USD
CY2018	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-7763000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1364000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	37420000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	37142000	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
CY2018	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	15037000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4281000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3822000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-188000	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
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2073000	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
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-338000	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
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-545000	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-75000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-77000	USD
CY2018	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-78000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2020Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	56868000	USD
CY2019Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	50608000	USD
CY2020Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3626000	USD
CY2019Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3661000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7339000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6543000	USD
CY2020Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	445000	USD
CY2019Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	519000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-271000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-399000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	61297000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	54408000	USD
CY2020Q4	msex	Lease Liability Noncurrent LeaseLiabilityNoncurrent	5000000.0	USD
CY2020	msex	Budgeted Construction Cost BudgetedConstructionCost	134000000	USD
CY2020	msex	Budgeted Construction Cost For Construction Program Year One BudgetedConstructionCostForConstructionProgramYearOne	97000000	USD
CY2020	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	4379000	USD
CY2020	msex	Budgeted Construction Cost For Construction Program Year Two BudgetedConstructionCostForConstructionProgramYearTwo	83000000	USD
CY2020	msex	Estimated Obligation Expend EstimatedObligationExpend	19000000	USD
CY2020	msex	Cost Of Untreated Water CostOfUntreatedWater	3400000	USD
CY2019	msex	Cost Of Untreated Water CostOfUntreatedWater	3400000	USD
CY2018	msex	Cost Of Untreated Water CostOfUntreatedWater	3600000	USD
CY2020	msex	Cost Of Treated Water CostOfTreatedWater	3600000	USD
CY2019	msex	Cost Of Treated Water CostOfTreatedWater	3200000	USD
CY2018	msex	Cost Of Treated Water CostOfTreatedWater	3200000	USD
CY2020	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	7000000.0	USD
CY2019	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6600000	USD
CY2018	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6800000	USD
CY2019Q4	us-gaap	Guaranty Liabilities GuarantyLiabilities	1400000	USD
CY2020Q4	us-gaap	Guaranty Liabilities GuarantyLiabilities	0	USD
CY2020	msex	Lease Maturity Date LeaseMaturityDate	2030
CY2020Q4	msex	Estimated Incremental Borrowing Rate EstimatedIncrementalBorrowingRate	0.0403	pure
CY2020	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	800000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	700000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	500000	USD
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	29	shares
CY2018	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends	24000	USD
CY2018	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	41	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	17574	shares
CY2020Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	USD
CY2019Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	USD
CY2020Q4	msex	Right Of Use Assets Accumulated Amortization RightOfUseAssetsAccumulatedAmortization	2100000	USD
CY2019Q4	msex	Right Of Use Assets Accumulated Amortization RightOfUseAssetsAccumulatedAmortization	1400000	USD
CY2020Q4	msex	Right Of Use Assets Current RightOfUseAssetsCurrent	5200000	USD
CY2019Q4	msex	Right Of Use Assets Current RightOfUseAssetsCurrent	5900000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	3600000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	7600000	USD
CY2020Q4	msex	Imputed Interest ImputedInterest	-1900000	USD
CY2020Q4	us-gaap	Present Value Of Future Minimum Lease Payments Sale Leaseback Transactions PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions	5700000	USD
CY2020Q4	msex	Operating Lease Liability And Other Liabilities Current OperatingLeaseLiabilityAndOtherLiabilitiesCurrent	-700000	USD
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	16829	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	32399000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16540	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.18
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2020	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	28300000	USD
CY2019	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	52400000	USD
CY2020	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0155	pure
CY2019	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0333	pure
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2000000.0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	20000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0104	pure
CY2019Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0286	pure
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2019	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	2492000	USD
CY2019Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	140000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	140000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	2000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	138000000.0	USD
CY2020Q4	msex	Reduce Line Of Credit ReduceLineOfCredit	30000000.0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	110000000.0	USD
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
CY2020Q4	msex	Additional Shares Authorized By Sec To Be Issued AdditionalSharesAuthorizedBySECToBeIssued	400000	shares
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	7300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	6700000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	16100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	6000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	5600000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17459	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16384	shares
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	120000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	132000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	144000	USD
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	17459	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	16685	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	32308000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16384	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
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	17459	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	16685	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	32308000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16384	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	115	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	115	shares
CY2018	msex	Convertible Dollar7 Preferred Series Stock Dividends ConvertibleDollar7PreferredSeriesStockDividends	67000	USD
CY2018	msex	Incremental Common Shares Attributable To Conversion Of Dollar7 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	115	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
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	129600000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	83000000.0	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
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	87600000	USD
CY2020	msex	Threshold Percentage Of Participants Compensation At Which Matching Decreases ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases	0.01	pure
CY2020	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
CY2018	msex	Matching Contributions MatchingContributions	600000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	700000	USD
CY2020	msex	Defined Contribution Plan Employer Discretionary Contribution Percent DefinedContributionPlanEmployerDiscretionaryContributionPercent	0.050	pure
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	700000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	600000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	300000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1700000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1700000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2020	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	141592000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	138077000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.075	pure
CY2020	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years One To Three IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree	0.005	pure
CY2020	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years Four And Five IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive	0.045	pure
CY2020	msex	Number Of Hours Required To Participate In Contribution Plan NumberOfHoursRequiredToParticipateInContributionPlan	1000	pure
CY2020	msex	Percent Of Participants Contributions Matched By Company Below One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation	1	pure
CY2020	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2018	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	2992000	USD
CY2020	us-gaap	Interest Expense InterestExpense	7493000	USD
CY2019	us-gaap	Interest Expense InterestExpense	7264000	USD
CY2018	us-gaap	Interest Expense InterestExpense	6758000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4119000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	38425000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2020	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	105619000	USD
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 Price HighCommonStockPrice	69.92
CY2020Q1	msex	Low Common Stock Price LowCommonStockPrice	48.79
CY2020Q2	msex	High Common Stock Price HighCommonStockPrice	72.41
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	89125000	USD
CY2018	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	72094000	USD
CY2020Q4	us-gaap	Assets Assets	976470000	USD
CY2020Q2	msex	Low Common Stock Price LowCommonStockPrice	53.70
CY2020Q3	msex	High Common Stock Price HighCommonStockPrice	69.89
CY2019Q4	us-gaap	Assets Assets	909878000	USD
CY2020Q3	msex	Low Common Stock Price LowCommonStockPrice	59.61
CY2020Q4	msex	High Common Stock Price HighCommonStockPrice	76.08
CY2020Q4	msex	Low Common Stock Price LowCommonStockPrice	61.81
CY2019Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	30698000	USD
CY2019Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	33393000	USD
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	37769000	USD
CY2019Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	32738000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	7028000	USD
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
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	8950000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	11983000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	7559000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	6552000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8146000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	11119000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	8071000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.49
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2400
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2400
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2400
CY2019Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2563
CY2019Q1	msex	High Common Stock Price HighCommonStockPrice	60.48
CY2019Q1	msex	Low Common Stock Price LowCommonStockPrice	51.02
CY2019Q2	msex	High Common Stock Price HighCommonStockPrice	63.68
CY2019Q2	msex	Low Common Stock Price LowCommonStockPrice	52.51
CY2019Q3	msex	High Common Stock Price HighCommonStockPrice	66.10
CY2019Q3	msex	Low Common Stock Price LowCommonStockPrice	55.30
CY2019Q4	msex	High Common Stock Price HighCommonStockPrice	67.69
CY2019Q4	msex	Low Common Stock Price LowCommonStockPrice	58.75

Files In Submission

Name	View Source	Status
0001174947-21-000198-index-headers.html	Edgar Link	pending
0001174947-21-000198-index.html	Edgar Link	pending
0001174947-21-000198.txt	Edgar Link	pending
0001174947-21-000198-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image_002.gif	Edgar Link	pending
item5chart2.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
msex-20201231.xsd	Edgar Link	pending
msex-20201231_cal.xml	Edgar Link	unprocessable
msex-20201231_def.xml	Edgar Link	unprocessable
msex-20201231_lab.xml	Edgar Link	unprocessable
msex-20201231_pre.xml	Edgar Link	unprocessable
msex10k2020.htm	Edgar Link	pending
msex10k2020_htm.xml	Edgar Link	completed
msex10kex10-30.htm	Edgar Link	pending
msex10kex10-48.htm	Edgar Link	pending
msex10kex21.htm	Edgar Link	pending
msex10kex23-1.htm	Edgar Link	pending
msex10kex31-1.htm	Edgar Link	pending
msex10kex31.htm	Edgar Link	pending
msex10kex32-1.htm	Edgar Link	pending
msex10kex32.htm	Edgar Link	pending
R1.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

2020 Form 10-K Financial Statement

#000117494721000198 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX MIDDLESEX WATER CO Stock $msex

2020 Form 10-K Financial Statement

#000117494721000198 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX
MIDDLESEX WATER CO Stock $msex