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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating revenues
Water sales	$ 64,667us-gaap_RegulatedOperatingRevenueWater	$ 61,846us-gaap_RegulatedOperatingRevenueWater	$ 63,607us-gaap_RegulatedOperatingRevenueWater
Other utility operating revenue	3,648us-gaap_RegulatedOperatingRevenueOther	3,253us-gaap_RegulatedOperatingRevenueOther	3,169us-gaap_RegulatedOperatingRevenueOther
Non-utility operating revenue	4,150us-gaap_OtherSalesRevenueNet	3,974us-gaap_OtherSalesRevenueNet	3,787us-gaap_OtherSalesRevenueNet
Total operating revenues	72,465us-gaap_RegulatedAndUnregulatedOperatingRevenue	69,073us-gaap_RegulatedAndUnregulatedOperatingRevenue	70,563us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating expenses
Utility operating expenses	34,893us-gaap_UtilitiesOperatingExpense	34,509us-gaap_UtilitiesOperatingExpense	34,117us-gaap_UtilitiesOperatingExpense
Non-utility operating expenses	2,193us-gaap_OtherCostAndExpenseOperating	2,121us-gaap_OtherCostAndExpenseOperating	2,100us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization	8,673us-gaap_DepreciationDepletionAndAmortization	8,251us-gaap_DepreciationDepletionAndAmortization	7,930us-gaap_DepreciationDepletionAndAmortization
State and federal income taxes
Current	(900)us-gaap_CurrentIncomeTaxExpenseBenefit	1,725us-gaap_CurrentIncomeTaxExpenseBenefit	1,940us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	7,275us-gaap_DeferredIncomeTaxExpenseBenefit	3,863us-gaap_DeferredIncomeTaxExpenseBenefit	4,676us-gaap_DeferredIncomeTaxExpenseBenefit
Property and other taxes	4,285us-gaap_TaxesExcludingIncomeAndExciseTaxes	4,120us-gaap_TaxesExcludingIncomeAndExciseTaxes	3,945us-gaap_TaxesExcludingIncomeAndExciseTaxes
Total operating expenses	56,419us-gaap_OperatingExpenses	54,589us-gaap_OperatingExpenses	54,708us-gaap_OperatingExpenses
Operating income	16,046us-gaap_OperatingIncomeLoss	14,484us-gaap_OperatingIncomeLoss	15,855us-gaap_OperatingIncomeLoss
Other income, net
Allowance for funds used during construction (AFUDC)	329us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	324us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	323us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Miscellaneous	524us-gaap_OtherNonoperatingIncomeExpense	548us-gaap_OtherNonoperatingIncomeExpense	713us-gaap_OtherNonoperatingIncomeExpense
Total other income	853us-gaap_OtherOperatingIncomeExpenseNet	872us-gaap_OtherOperatingIncomeExpenseNet	1,036us-gaap_OtherOperatingIncomeExpenseNet
Income before interest charges	16,899us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15,356us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16,891us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Interest charges	7,393us-gaap_InterestExpense	7,055us-gaap_InterestExpense	7,045us-gaap_InterestExpense
Net income applicable to common stock	$ 9,506us-gaap_NetIncomeLoss	$ 8,301us-gaap_NetIncomeLoss	$ 9,846us-gaap_NetIncomeLoss
Income per common share:
Basic (in dollars per share)	$ 1.07us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.07us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic (in shares)	8,884us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,774us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,666us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	8,926us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,836us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,717us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash dividends per share of common stock (in dollars per share)	$ 0.8477us-gaap_CommonStockDividendsPerShareDeclared	$ 0.8229us-gaap_CommonStockDividendsPerShareDeclared	$ 0.7913us-gaap_CommonStockDividendsPerShareDeclared

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The amount of regulated water operating revenues recognized during the period.

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All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.9)



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Amount of operating expense of regulated operation.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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