Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Regulated Tariff Sales
Residential	$ 20,238	$ 19,454	$ 37,195	$ 36,135
Commercial	4,108	3,649	7,684	7,018
Industrial	2,143	2,175	4,320	4,256
Fire Protection	3,161	3,060	6,265	6,106
Wholesale	3,718	3,827	7,256	7,525
Non-Regulated Contract Operations	3,298	3,076	6,449	5,934
Total Revenue from Contracts with Customers	36,666	35,241	69,169	66,974
Other Regulated Revenues	241	124	310	186
Other Non-Regulated Revenues	107	104	213	207
Inter-segment Elimination	(313)	(192)	(450)	(321)
Total Revenue	$ 36,701	$ 35,277	$ 69,242	$ 67,046