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Business Segment Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 N	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of Reportable Segments									2us-gaap_NumberOfReportableSegments
Revenues	$ 28,107	$ 32,669	$ 29,190	$ 27,173	$ 27,421	$ 31,285	$ 29,102	$ 27,038	$ 117,139	$ 114,846	$ 110,379
Operating Income	8,058us-gaap_OperatingIncomeLoss	11,620us-gaap_OperatingIncomeLoss	8,747us-gaap_OperatingIncomeLoss	5,967us-gaap_OperatingIncomeLoss	6,664us-gaap_OperatingIncomeLoss	10,270us-gaap_OperatingIncomeLoss	8,171us-gaap_OperatingIncomeLoss	5,865us-gaap_OperatingIncomeLoss	34,392us-gaap_OperatingIncomeLoss	30,970us-gaap_OperatingIncomeLoss	27,647us-gaap_OperatingIncomeLoss
Depreciation									11,444	10,988	10,409
Other Income (Expense), Net									(403)us-gaap_OtherNonrecurringIncomeExpense	91us-gaap_OtherNonrecurringIncomeExpense	857us-gaap_OtherNonrecurringIncomeExpense
Interest Expense									5,607us-gaap_InterestExpense	5,807us-gaap_InterestExpense	6,725us-gaap_InterestExpense
Income Taxes									9,937us-gaap_IncomeTaxExpenseBenefit	8,621us-gaap_IncomeTaxExpenseBenefit	7,383us-gaap_IncomeTaxExpenseBenefit
Net Income	3,790us-gaap_NetIncomeLoss	6,758us-gaap_NetIncomeLoss	4,728us-gaap_NetIncomeLoss	3,169us-gaap_NetIncomeLoss	3,168us-gaap_NetIncomeLoss	5,807us-gaap_NetIncomeLoss	4,481us-gaap_NetIncomeLoss	3,177us-gaap_NetIncomeLoss	18,445us-gaap_NetIncomeLoss	16,633us-gaap_NetIncomeLoss	14,396us-gaap_NetIncomeLoss
Capital Expenditures									22,596	20,080	21,578
Assets	575,772us-gaap_Assets				530,341us-gaap_Assets				575,772us-gaap_Assets	530,341us-gaap_Assets
Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									103,556	100,910	98,021
Operating Income									32,000	28,744	25,944
Depreciation									11,262	10,807	10,241
Other Income (Expense), Net									157	828	1,489
Interest Expense									5,607	5,807	6,725
Income Taxes									8,907	7,635	6,579
Net Income									17,249	15,504	13,500
Capital Expenditures									22,498	19,894	21,149
Assets	574,854				529,381				574,854	529,381
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									14,143	14,463	12,851
Operating Income									2,392	2,226	1,703
Depreciation									182	181	168
Other Income (Expense), Net									(75)	(14)	94
Interest Expense									91	97	96
Income Taxes									1,030	986	804
Net Income									1,196	1,129	896
Capital Expenditures									98	186	429
Assets	7,252				8,887				7,252	8,887
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									(560)	(527)	(493)
Other Income (Expense), Net									(485)	(723)	(726)
Interest Expense									(91)	(97)	(96)
Assets	$ (6,334)				$ (7,927)				$ (6,334)	$ (7,927)