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Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Regulated Tariff Sales    
Residential $ 16,681 $ 15,980
Commercial 3,369 3,309
Industrial 2,081 2,198
Fire Protection 3,045 3,013
Wholesale 3,698 3,339
Non-Regulated Contract Operations 2,859 2,824
Total Revenue from Contracts with Customers 31,733 30,663
Other Regulated Revenues 62 58
Other Non-Regulated Revenues 103 102
Inter-segment Elimination (129) (125)
Total Revenue $ 31,769 $ 30,698