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Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Regulated Tariff Sales        
Residential $ 22,340 $ 20,693 $ 58,475 $ 54,453
Commercial 4,660 4,487 11,678 11,539
Industrial 2,629 2,723 6,885 7,242
Fire Protection 3,129 3,100 9,235 9,211
Wholesale 4,028 3,813 11,553 10,582
Non-Regulated Contract Operations 3,100 2,919 9,034 8,729
Total Revenue from Contracts with Customers 39,886 37,735 106,860 101,756
Other Regulated Revenues 255 184 441 315
Other Non-Regulated Revenues 104 101 311 303
Inter-segment Elimination (325) (251) (647) (515)
Total Revenue $ 39,920 $ 37,769 $ 106,965 $ 101,859