Business Segment Data (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	2
Revenues	$ 36,196	$ 32,541
Operating Income	12,523	5,634
Net Income	12,100	6,907
Capital Expenditures	16,631	22,033
Assets	1,009,584		$ 1,020,015
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues	(138)	(137)
Assets	(13,853)		(9,912)
Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	33,325	29,421
Operating Income	11,705	4,716
Net Income	11,513	6,240
Capital Expenditures	16,585	21,963
Assets	1,015,059		1,022,116
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	3,009	3,257
Operating Income	818	918
Net Income	587	667
Capital Expenditures	46	$ 70
Assets	$ 8,378		$ 7,811