$MSEX
MIDDLESEX WATER CO Stock $msex

$msex Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000117494720000248 Filed on February 27, 2020

Income Statement

Concept	2018 Q4	2018 Q3	2018 Q2
Revenue	$33.27M	$38.71M	$34.92M
YoY Change	5.75%	7.03%	5.78%
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	$4.040M	$3.950M	$4.020M
YoY Change	-3.12%	4.22%	15.52%
% of Gross Profit
Operating Expenses	$26.12M	$25.80M	$24.20M
YoY Change	12.63%	9.46%	2.28%
Operating Profit	$7.153M	$12.92M	$10.72M
YoY Change
Interest Expense	-$1.830M	-$1.720M	-$2.070M
YoY Change	18.83%	15.44%	40.82%
% of Operating Profit	-25.58%	-13.31%	-19.31%
Other Income/Expense, Net	$910.0K	$830.0K	$780.0K
YoY Change	97.83%	97.62%	90.24%
Pretax Income	$6.230M	$12.03M	$9.440M
YoY Change	-13.23%	4.34%	13.73%
Income Tax	-$760.0K	-$260.0K	$760.0K
% Of Pretax Income	-12.2%	-2.16%	8.05%
Net Earnings	$6.993M	$12.29M	$8.675M
YoY Change	30.71%	60.86%	61.25%
Net Earnings / Revenue	21.02%	31.75%	24.84%
Basic Earnings Per Share	$0.43	$0.75	$0.52
Diluted Earnings Per Share	$0.43	$0.74	$0.52
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding

Balance Sheet

Concept	2018 Q4	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.700M	$3.600M	$2.700M
YoY Change	-24.49%	33.33%	-27.03%
Cash & Equivalents	$5.661M	$3.600M	$2.700M
Short-Term Investments
Other Short-Term Assets	$9.900M	$12.60M	$12.50M
YoY Change	5.32%	12.5%	11.61%
Inventory	$5.400M	$5.600M	$4.800M
Prepaid Expenses
Receivables	$11.80M	$13.50M	$11.00M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$30.80M	$35.40M	$31.10M
YoY Change	5.48%	17.61%	4.71%
LONG-TERM ASSETS
Property, Plant & Equipment	$628.5M	$608.7M	$590.1M
YoY Change	10.91%	9.73%	8.75%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$108.5M	$108.2M	$108.2M
YoY Change	67.7%	66.72%	68.27%
Total Long-Term Assets	$737.0M	$717.4M	$698.6M
YoY Change	16.64%	15.37%	14.71%
TOTAL ASSETS
Total Short-Term Assets	$30.80M	$35.40M	$31.10M
Total Long-Term Assets	$737.0M	$717.4M	$698.6M
Total Assets	$767.8M	$752.8M	$729.7M
YoY Change	16.14%	15.48%	14.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$19.30M	$19.50M	$16.40M
YoY Change	38.85%	61.16%	9.33%
Accrued Expenses	$1.300M	$500.0K	$1.300M
YoY Change	18.18%	25.0%	18.18%
Deferred Revenue
YoY Change
Short-Term Debt	$48.50M	$48.50M	$39.00M
YoY Change	73.21%	97.96%	129.41%
Long-Term Debt Due	$7.343M	$7.300M	$7.200M
YoY Change	6.42%	12.31%	16.13%
Total Short-Term Liabilities	$94.40M	$94.40M	$81.60M
YoY Change	46.36%	60.0%	47.29%
LONG-TERM LIABILITIES
Long-Term Debt	$152.9M	$141.1M	$142.1M
YoY Change	9.96%	3.9%	4.18%
Other Long-Term Liabilities	$222.1M	$223.9M	$223.8M
YoY Change	21.5%	52.62%	54.24%
Total Long-Term Liabilities	$152.9M	$365.0M	$365.9M
YoY Change	-52.5%	29.2%	29.98%
TOTAL LIABILITIES
Total Short-Term Liabilities	$94.40M	$94.40M	$81.60M
Total Long-Term Liabilities	$152.9M	$365.0M	$365.9M
Total Liabilities	$516.6M	$505.2M	$491.2M
YoY Change	20.28%	19.57%	18.65%
SHAREHOLDERS EQUITY
Retained Earnings	$91.43M
YoY Change
Common Stock	$157.4M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$251.2M	$247.6M	$238.5M
YoY Change
Total Liabilities & Shareholders Equity	$767.8M	$752.8M	$729.7M
YoY Change	16.14%	15.48%	14.25%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$6.993M	$12.29M	$8.675M
YoY Change	30.71%	60.86%	61.25%
Depreciation, Depletion And Amortization	$4.040M	$3.950M	$4.020M
YoY Change	-3.12%	4.22%	15.52%
Cash From Operating Activities	$13.00M	$13.64M	$10.24M
YoY Change	-8.39%	60.85%	1.59%
INVESTING ACTIVITIES
Capital Expenditures	-$22.57M	-$21.14M	-$18.37M
YoY Change	49.17%	51.0%	58.5%
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$22.57M	-$21.14M	-$18.37M
YoY Change	49.17%	51.0%	58.5%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	9.700M	7.200M	11.19M
YoY Change	130.95%	58.59%	-2897.5%
NET CHANGE
Cash From Operating Activities	13.00M	13.64M	10.24M
Cash From Investing Activities	-22.57M	-21.14M	-18.37M
Cash From Financing Activities	9.700M	7.200M	11.19M
Net Change In Cash	130.0K	-300.0K	3.060M
YoY Change	-96.01%	-69.39%	-260.21%
FREE CASH FLOW
Cash From Operating Activities	$13.00M	$13.64M	$10.24M
Capital Expenditures	-$22.57M	-$21.14M	-$18.37M
Free Cash Flow	$35.57M	$34.78M	$28.61M
YoY Change	21.32%	54.72%	32.03%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	msex	Operations And Maintenance OperationsAndMaintenance	67980000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	99078000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2019	us-gaap	Taxes Other TaxesOther	14382000	USD
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000066004
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	941981504	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17435830	shares
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2019	us-gaap	Depreciation Depreciation	16716000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3146000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-654000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	2492000	USD
CY2019	us-gaap	Interest Expense InterestExpense	7264000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	30748000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	132000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16829000	shares
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	160870000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	556517000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	83043000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	75520000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	875950000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	170220000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	705730000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2230000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	11908000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	7183000	USD
CY2019Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	5445000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	2367000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	29133000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5944000	USD
CY2019Q4	msex	Preliminary Survey And Investigation Charges PreliminarySurveyAndInvestigationCharges	2054000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	110479000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	44269000	USD
CY2019Q4	msex	Non Utility Assets Net NonUtilityAssetsNet	10370000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1899000	USD
CY2019Q4	msex	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	175015000	USD
CY2019Q4	us-gaap	Assets Assets	909878000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	215125000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	108667000	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
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
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	54408000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	47270000	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
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
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	17232000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-11719000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1997000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	252000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	637000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	146000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-110000	USD
CY2019	us-gaap	Increase Decrease In Raw Materials Packaging Materials And Supplies Inventories IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories	34000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-277000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3981000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-6595000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	742000	USD
CY2019	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-1112000	USD
CY2019	msex	Change In Deferred Revenue ChangeInDeferredRevenue	175000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	36053000	USD
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	89125000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-89125000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7343000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	78967000	USD
CY2018	msex	Deobligated Principal Payments DeobligatedPrincipalPayments		USD
CY2017	msex	Deobligated Principal Payments DeobligatedPrincipalPayments		USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	6938000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	6113000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	5616000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1149000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	443000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	221000	USD
CY2019	msex	Proceeds From Premium Issuance Of Longterm Debt ProceedsFromPremiumIssuanceOfLongtermDebt	7083000	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
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	357000	USD
CY2017	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts		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
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1234000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16165000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14930000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14002000	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
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	144000	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
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1315000	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
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9537000	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
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2079000	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
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4318000	USD
CY2019	us-gaap	Contribution Of Property ContributionOfProperty	7770000	USD
CY2018	us-gaap	Contribution Of Property ContributionOfProperty	3835000	USD
CY2017	us-gaap	Contribution Of Property ContributionOfProperty	3778000	USD
CY2019	msex	Deobligated Principal Payments DeobligatedPrincipalPayments	130000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10339000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4689000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2754000	USD
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	17434000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	16403000	shares
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	215125000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	157354000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	108667000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	91433000	USD
CY2019Q4	msex	Total Common Equity TotalCommonEquity	323792000	USD
CY2018Q4	msex	Total Common Equity TotalCommonEquity	248787000	USD
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	120000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	20000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	23000	shares
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	2084000	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	2433000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	234397000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	162904000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	8064000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	1259000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4506000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	3969000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7178000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7343000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	230777000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	152851000	USD
CY2016Q4	msex	Total Common Equity TotalCommonEquity	218437000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	22809000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1234000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	724000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	147000	USD
CY2017	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	30000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14002000	USD
CY2017	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	144000	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	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
CY2019	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;color:#000000; "> <span style="font-weight: bold; ">(a) </span><span style="font-weight: bold; ">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;color:#000000; ">Middlesex Water Company has operated as a water utility in New Jersey since 1897, in Delaware, through our wholly-owned subsidiary, Tidewater, since 1992 and in Pennsylvania, through our wholly-owned subsidiary, Twin Lakes, since 2009. 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> <p style="font-family: Times New Roman, Times, serif; font-size:10pt; text-align:justify; margin-top:11pt; margin-bottom: 0pt;color:#000000; ">Certain reclassifications have been made to the prior year financial statements to conform with current period presentation. The reclassifications are immaterial to the overall presentation of our consolidated financial statements. </p>
CY2019	msex	Percent Voting Interest PercentVotingInterest	0.50	pure
CY2019	msex	Percent Of Operating Revenues PercentOfOperatingRevenues	0.91	pure
CY2019	msex	Percent Of Total Assets PercentOfTotalAssets	0.99	pure
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1400000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1000000.0	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000.0	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	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
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	500000	USD
CY2019	msex	Residential Operating Revenues ResidentialOperatingRevenues	71487000	USD
CY2018	msex	Residential Operating Revenues ResidentialOperatingRevenues	69785000	USD
CY2017	msex	Residential Operating Revenues ResidentialOperatingRevenues	66483000	USD
CY2019	msex	Commercial Operating Revenues CommercialOperatingRevenues	15198000	USD
CY2018	msex	Commercial Operating Revenues CommercialOperatingRevenues	14844000	USD
CY2017	msex	Commercial Operating Revenues CommercialOperatingRevenues	13956000	USD
CY2019	msex	Industrial Operating Revenues IndustrialOperatingRevenues	9390000	USD
CY2018	msex	Industrial Operating Revenues IndustrialOperatingRevenues	10183000	USD
CY2017	msex	Industrial Operating Revenues IndustrialOperatingRevenues	9321000	USD
CY2019	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12291000	USD
CY2018	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	12099000	USD
CY2017	msex	Residential Commercial Industrial And Fire Protection Revenue ResidentialCommercialIndustrialAndFireProtectionRevenue	11812000	USD
CY2018	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	404000	USD
CY2017	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	404000	USD
CY2019	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-657000	USD
CY2018	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-602000	USD
CY2017	msex	Inter Segment Elimination Operating Revenues InterSegmentEliminationOperatingRevenues	-591000	USD
CY2019	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14319000	USD
CY2018	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	14655000	USD
CY2017	msex	Wholesale Municipal Revenue WholesaleMunicipalRevenue	13553000	USD
CY2019	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	11773000	USD
CY2018	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	16374000	USD
CY2017	msex	Nonregualted Contract Operations Revenue NonregualtedContractOperationsRevenue	15508000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	134458000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	137940000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	130633000	USD
CY2019	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	393000	USD
CY2018	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	335000	USD
CY2017	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	329000	USD
CY2019	msex	Other Nonregulated Revenues OtherNonregulatedRevenues	404000	USD
CY2019	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;color:#000000; "> <span style="font-weight: bold; ">(q) </span><span style="font-weight: bold; ">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>
CY2017	msex	Operations And Maintenance Expense And Other Income Expense Net OperationsAndMaintenanceExpenseAndOtherIncomeExpenseNet	800000	USD
CY2019	msex	Adoption Of Right Of Use Asset AdoptionOfRightOfUseAsset	6700000	USD
CY2019	msex	Adoption Of Lease Liability AdoptionOfLeaseLiability	7100000	USD
CY2019Q4	us-gaap	Amount Of Embedded Regulatory Asset AmountOfEmbeddedRegulatoryAsset	400000	USD
CY2019Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.0335	pure
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	110479000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	99236000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	31500000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	31700000	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
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	11868000	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
CY2017	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	-1016000	USD
CY2019	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-10156000	USD
CY2018	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs	-7763000	USD
CY2017	msex	Income Tax Reconciliation Tangible Property Repairs IncomeTaxReconciliationTangiblePropertyRepairs		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
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	895000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther		USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther		USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	610000	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
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-37000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11100000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3822000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-188000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2090000	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
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1066000	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
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7713000	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
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	310000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-77000	USD
CY2018	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-78000	USD
CY2017	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-79000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11100000	USD
CY2019Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	50608000	USD
CY2018Q4	msex	Deferred Tax Liabilities Utility Plant Related DeferredTaxLiabilitiesUtilityPlantRelated	44777000	USD
CY2019Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3661000	USD
CY2018Q4	msex	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	3702000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6543000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5490000	USD
CY2019Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	519000	USD
CY2018Q4	msex	Deferred Tax Liabilities Investment Tax Credits DeferredTaxLiabilitiesInvestmentTaxCredits	596000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-399000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-109000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	54408000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	47270000	USD
CY2019	msex	Cost Of Untreated Water CostOfUntreatedWater	3400000	USD
CY2018	msex	Cost Of Untreated Water CostOfUntreatedWater	3600000	USD
CY2017	msex	Cost Of Untreated Water CostOfUntreatedWater	2800000	USD
CY2019	msex	Cost Of Treated Water CostOfTreatedWater	3200000	USD
CY2018	msex	Cost Of Treated Water CostOfTreatedWater	3200000	USD
CY2017	msex	Cost Of Treated Water CostOfTreatedWater	3300000	USD
CY2019	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6600000	USD
CY2018	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6800000	USD
CY2017	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	6100000	USD
CY2019Q4	us-gaap	Guaranty Liabilities GuarantyLiabilities	1400000	USD
CY2018Q4	us-gaap	Guaranty Liabilities GuarantyLiabilities	1500000	USD
CY2019	msex	Lease Maturity Date LeaseMaturityDate	2030
CY2019Q4	msex	Estimated Incremental Borrowing Rate EstimatedIncrementalBorrowingRate	0.0403	pure
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	700000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	500000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	1000	USD
CY2019Q4	msex	Right Of Use Asset At Lease Inception RightOfUseAssetAtLeaseInception	7300000	USD
CY2019Q4	msex	Right Of Use Assets Accumulated Amortization RightOfUseAssetsAccumulatedAmortization	-1400000	USD
CY2019Q4	msex	Right Of Use Assets Current RightOfUseAssetsCurrent	5900000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	4400000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	8400000	USD
CY2019Q4	msex	Imputed Interest ImputedInterest	-2000000.0	USD
CY2019Q4	us-gaap	Present Value Of Future Minimum Lease Payments Sale Leaseback Transactions PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions	6400000	USD
CY2019Q4	msex	Operating Lease Liability And Other Liabilities Current OperatingLeaseLiabilityAndOtherLiabilitiesCurrent	-700000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5700000	USD
CY2019	msex	Budgeted Construction Cost BudgetedConstructionCost	124000000	USD
CY2019	msex	Budgeted Construction Cost For Construction Program Year One BudgetedConstructionCostForConstructionProgramYearOne	112000000	USD
CY2018	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	37300000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	20000000.0	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	48500000	USD
CY2019	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0333	pure
CY2018	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0317	pure
CY2019Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0286	pure
CY2018Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0357	pure
CY2019	msex	Budgeted Construction Cost For Construction Program Year Two BudgetedConstructionCostForConstructionProgramYearTwo	59000000	USD
CY2019	msex	Estimated Obligation Expend EstimatedObligationExpend	63000000	USD
CY2019	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	140000000.0	USD
CY2018	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	92000000.0	USD
CY2019	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	59400000	USD
CY2018	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	48500000	USD
CY2019	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	52400000	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
CY2019Q4	msex	Additional Shares Authorized By Sec To Be Issued AdditionalSharesAuthorizedBySECToBeIssued	400000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	100000	shares
CY2018Q2	us-gaap	Proceeds From Issuance Of First Mortgage Bond ProceedsFromIssuanceOfFirstMortgageBond	9500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	7200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	7200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	6700000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	6200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	6000000.0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16685000	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16384000	shares
CY2017	us-gaap	Net Income Loss NetIncomeLoss	22809000	USD
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16330000	shares
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	132000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	144000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	144000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	32308000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22665000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.39
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33756000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	32308000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22665000	USD
CY2017	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
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	115000	shares
CY2019	msex	Convertible Dollar7 Preferred Series Stock Dividends ConvertibleDollar7PreferredSeriesStockDividends	67000	USD
CY2017	msex	Incremental Common Shares Attributable To Conversion Of Dollar7 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	115000	shares
CY2019	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	29000	shares
CY2017	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends	24000	USD
CY2018	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	41000	shares
CY2018	msex	Convertible Dollar8 Preferred Series Stock Dividends ConvertibleDollar8PreferredSeriesStockDividends	24000	USD
CY2017	msex	Incremental Common Shares Attributable To Conversion Of Dollar8 Preferred Series Stock IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	41000	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
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	16540000	shares
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	22756000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16486000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.38
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	83000000.0	USD
CY2018Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	61500000	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
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	73100000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	700000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.080	pure
CY2019	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years One To Three IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree	0.010	pure
CY2019	msex	Threshold Percentage Of Participants Compensation At Which Matching Decreases ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases	0.010	pure
CY2019	msex	Increase Decrease In Annual Rate Per Capita Cost Of Covered Healthcare Benefits Years Four And Five IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive	0.005	pure
CY2019	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2019Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.05	pure
CY2019	msex	Number Of Hours Required To Participate In Contribution Plan NumberOfHoursRequiredToParticipateInContributionPlan	1000	pure
CY2019	msex	Percent Of Participants Contributions Matched By Company Below One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation	1	pure
CY2019	msex	Percent Of Participants Contributions Matched By Company Above One Percent Of Participants Compensation PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation	0.50	pure
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2019	msex	Matching Contributions MatchingContributions	7000	USD
CY2018	msex	Matching Contributions MatchingContributions	6000	USD
CY2017	msex	Matching Contributions MatchingContributions	6000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.050	pure
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	600000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	500000	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
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1300000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	134598000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	138077000	USD
CY2017	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	130775000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	35520000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	37142000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	37798000	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
CY2017	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	13922000	USD
CY2019	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	2492000	USD
CY2018	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	2992000	USD
CY2017	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	1617000	USD
CY2019	us-gaap	Interest Expense InterestExpense	7264000	USD
CY2018	us-gaap	Interest Expense InterestExpense	6758000	USD
CY2017	us-gaap	Interest Expense InterestExpense	5506000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3140000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	924000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	33888000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	22809000	USD
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
CY2017	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	50301000	USD
CY2019Q4	us-gaap	Assets Assets	909878000	USD
CY2018Q4	us-gaap	Assets Assets	767830000	USD
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
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
CY2018Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	31177000	USD
CY2018Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	34919000	USD
CY2018Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	38713000	USD
CY2018Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	33268000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	138077000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	6350000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	10721000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	12918000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	7153000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	37142000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	4494000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	8675000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	12290000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	6993000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	32452000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2238
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2238
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2238
CY2018Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2400
CY2018Q1	msex	High Common Stock Price HighCommonStockPrice	41.45
CY2018Q1	msex	Low Common Stock Price LowCommonStockPrice	33.96
CY2018Q2	msex	High Common Stock Price HighCommonStockPrice	45.24
CY2018Q2	msex	Low Common Stock Price LowCommonStockPrice	34.74
CY2018Q3	msex	High Common Stock Price HighCommonStockPrice	49.00
CY2018Q3	msex	Low Common Stock Price LowCommonStockPrice	41.77
CY2018Q4	msex	High Common Stock Price HighCommonStockPrice	60.31
CY2018Q4	msex	Low Common Stock Price LowCommonStockPrice	43.12

Files In Submission

Name	View Source	Status
0001174947-20-000248-index-headers.html	Edgar Link	pending
0001174947-20-000248-index.html	Edgar Link	pending
0001174947-20-000248.txt	Edgar Link	pending
0001174947-20-000248-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
item5chart.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
msex-20191231.xsd	Edgar Link	pending
msex-20191231_cal.xml	Edgar Link	unprocessable
msex-20191231_def.xml	Edgar Link	unprocessable
msex-20191231_lab.xml	Edgar Link	unprocessable
msex-20191231_pre.xml	Edgar Link	unprocessable
msex10k2019.htm	Edgar Link	pending
msex10k2019_htm.xml	Edgar Link	completed
msex10kex10-12f.htm	Edgar Link	pending
msex10kex10-12g.htm	Edgar Link	pending
msex10kex10-12h.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

2018 Q4 Form 10-K Financial Statement

#000117494720000248 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX MIDDLESEX WATER CO Stock $msex

2018 Q4 Form 10-K Financial Statement

#000117494720000248 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSEX
MIDDLESEX WATER CO Stock $msex