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Business Segment Data (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	2	2
Operating Revenues	$ 30,698	$ 31,177
Operating Income	7,028	6,350
Net Income	6,552	4,494
Capital Expenditures	12,324	10,011
Assets	782,973		$ 767,830
Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	27,898	27,206
Operating Income	6,034	5,625
Net Income	5,868	3,983
Capital Expenditures	12,293	9,978
Assets	780,317		764,749
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,925	4,100
Operating Income	994	725
Net Income	684	511
Capital Expenditures	31	33
Assets	9,087		8,994
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(125)	$ (129)
Assets	$ (6,431)		$ (5,913)

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