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Business Segment Data (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Operating Revenues	$ 36,174	$ 37,794	$ 99,319	$ 101,098
Operating Income	12,806	14,156	30,149	32,785
Net Income	7,642	8,813	17,463	19,522
Capital Expenditures	14,005	14,035	35,170	34,146
Assets	651,919		651,919		$ 620,161
Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	32,252	33,989	88,023	89,797
Operating Income	12,098	13,516	28,195	30,940
Net Income	7,232	8,154	16,341	18,226
Capital Expenditures	13,998	14,011	35,157	33,961
Assets	654,248		654,248		619,915
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	4,142	3,949	11,755	11,685
Operating Income	708	640	1,954	1,845
Net Income	410	659	1,122	1,296
Capital Expenditures	7	24	13	185
Assets	6,772		6,772		6,245
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(220)	$ (144)	(459)	$ (384)
Assets	$ (9,101)		$ (9,101)		$ (5,999)

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