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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME [Abstract]      
Operating Revenues $ 117,139us-gaap_RegulatedAndUnregulatedOperatingRevenue $ 114,846us-gaap_RegulatedAndUnregulatedOperatingRevenue $ 110,379us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Expenses:      
Operations and Maintenance 59,129msex_OperationsAndMaintenance 60,748msex_OperationsAndMaintenance 60,458msex_OperationsAndMaintenance
Depreciation 11,444us-gaap_CostOfGoodsSoldDepreciationAndAmortization 10,988us-gaap_CostOfGoodsSoldDepreciationAndAmortization 10,409us-gaap_CostOfGoodsSoldDepreciationAndAmortization
Other Taxes 12,174us-gaap_TaxesOther 12,140us-gaap_TaxesOther 11,865us-gaap_TaxesOther
Total Operating Expenses 82,747us-gaap_OperatingExpenses 83,876us-gaap_OperatingExpenses 82,732us-gaap_OperatingExpenses
Operating Income 34,392us-gaap_OperatingIncomeLoss 30,970us-gaap_OperatingIncomeLoss 27,647us-gaap_OperatingIncomeLoss
Other Income (Expense):      
Public Utilities, Allowance for Funds Used During Construction, Additions 317us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions 314us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions 484us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Other Income 281us-gaap_OtherIncome 183us-gaap_OtherIncome 517us-gaap_OtherIncome
Other Expense (1,001)us-gaap_OtherExpenses (406)us-gaap_OtherExpenses (144)us-gaap_OtherExpenses
Total Other Income (Expense), net (403)us-gaap_NonoperatingIncomeExpense 91us-gaap_NonoperatingIncomeExpense 857us-gaap_NonoperatingIncomeExpense
Interest Charges 5,607us-gaap_InterestExpense 5,807us-gaap_InterestExpense 6,725us-gaap_InterestExpense
Income before Income Taxes 28,382us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 25,254us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 21,779us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Taxes 9,937us-gaap_IncomeTaxExpenseBenefit 8,621us-gaap_IncomeTaxExpenseBenefit 7,383us-gaap_IncomeTaxExpenseBenefit
Net Income 18,445us-gaap_NetIncomeLoss 16,633us-gaap_NetIncomeLoss 14,396us-gaap_NetIncomeLoss
Preferred Stock Dividend Requirements 151us-gaap_PreferredStockDividendsIncomeStatementImpact 190us-gaap_PreferredStockDividendsIncomeStatementImpact 206us-gaap_PreferredStockDividendsIncomeStatementImpact
Earnings Applicable to Common Stock $ 18,294us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 16,443us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 14,190us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share of Common Stock:      
Basic $ 1.14us-gaap_EarningsPerShareBasic $ 1.04us-gaap_EarningsPerShareBasic $ 0.90us-gaap_EarningsPerShareBasic
Diluted $ 1.13us-gaap_EarningsPerShareDiluted $ 1.03us-gaap_EarningsPerShareDiluted $ 0.90us-gaap_EarningsPerShareDiluted
Average Number of Common Shares Outstanding :      
Basic 16,052us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,868us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 16,226us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 16,110us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 15,995us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash Dividends Paid per Common Share (in dollars per share) $ 0.763us-gaap_CommonStockDividendsPerShareCashPaid $ 0.753us-gaap_CommonStockDividendsPerShareCashPaid $ 0.743us-gaap_CommonStockDividendsPerShareCashPaid