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Business Segment Data (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2	2
Operating Revenues	$ 38,713	$ 36,174	$ 104,809	$ 99,319
Operating Income	12,918	12,601	29,989	29,534
Net Income	12,290	7,642	25,459	17,463
Capital Expenditures	21,141	14,005	49,518	35,170
Assets	752,798		752,798		$ 661,140
Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	34,628	32,252	93,002	88,023
Operating Income	12,214	11,894	27,827	27,580
Net Income	11,770	7,232	23,904	16,341
Capital Expenditures	21,141	13,998	49,469	35,157
Assets	754,309		754,309		661,816
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	4,304	4,142	12,286	11,755
Operating Income	704	707	2,162	1,954
Net Income	520	410	1,555	1,122
Capital Expenditures		7	49	13
Assets	6,950		6,950		7,093
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(219)	$ (220)	(479)	$ (459)
Assets	$ (8,461)		$ (8,461)		$ (7,769)

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