Business Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 39,683	$ 36,701	$ 75,879	$ 69,242
Operating Income	10,088	9,814	22,612	15,448
Net Income	8,868	10,923	20,968	17,828
Capital Expenditures	22,712	24,467	39,343	46,500
Assets	1,038,018		1,038,018		$ 1,020,015
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues	(229)	(313)	(367)	(450)
Assets	(14,578)		(14,578)		(9,912)
Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	37,037	33,609	70,361	63,030
Operating Income	9,336	8,711	21,043	13,427
Net Income	8,314	10,108	19,814	16,347
Capital Expenditures	22,549	24,391	39,134	46,354
Assets	1,046,001		1,046,001		1,022,116
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	2,875	3,405	5,885	6,662
Operating Income	752	1,103	1,569	2,021
Net Income	554	815	1,154	1,481
Capital Expenditures	163	$ 76	209	$ 146
Assets	$ 6,595		$ 6,595		$ 7,811