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Organization, Summary of Significant Accounting Policies and Recent Developments (Schedule of Operating Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Regulated Tariff Sales                      
Residential                 $ 77,699 $ 76,798 $ 71,487
Commercial                 16,715 15,448 15,198
Industrial                 8,990 9,512 9,390
Fire Protection                 12,608 12,374 12,291
Wholesale                 14,590 15,187 14,319
Non-Regulated Contract Operations                 12,391 12,130 11,773
Total Revenue from Contracts with Customers                 142,993 141,449 134,458
Other Regulated Revenues                 929 532 393
Other Non-Regulated Revenues                 427 415 404
Inter-segment Elimination                 (1,208) (804) (657)
Total Revenue $ 34,025 $ 39,874 $ 36,701 $ 32,541 $ 34,626 $ 39,920 $ 35,277 $ 31,769 $ 143,141 $ 141,592 $ 134,598