Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Regulated Tariff Sales
Residential	$ 22,517	$ 22,340	$ 59,711	$ 58,475
Commercial	4,903	4,660	12,587	11,678
Industrial	2,538	2,629	6,858	6,885
Fire Protection	3,171	3,129	9,436	9,235
Wholesale	3,822	4,028	11,079	11,553
Non-Regulated Contract Operations	2,888	3,100	9,336	9,034
Total Revenue from Contracts with Customers	39,839	39,886	109,007	106,860
Other Regulated Revenues	445	255	755	441
Other Non-Regulated Revenues	107	104	321	311
Inter-segment Elimination	(517)	(325)	(966)	(647)
Total Revenue	$ 39,874	$ 39,920	$ 109,117	$ 106,965