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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Regulated Tariff Sales                      
Residential                 $ 69,785 $ 66,483 $ 66,849
Commercial                 14,844 13,956 14,189
Industrial                 10,183 9,321 9,558
Fire Protection                 12,099 11,812 11,732
Wholesale                 14,655 13,553 15,428
Non-Regulated Contract Operations                 16,374 15,508 14,988
Total Revenue from Contracts with Customers                 137,940 130,633 132,744
Other Regulated Revenues                 335 329 261
Other Non-Regulated Revenues                 404 404 400
Inter-segment Elimination                 (602) (591) (499)
Total Revenue $ 33,268 $ 38,713 $ 34,919 $ 31,177 $ 31,456 $ 36,174 $ 33,014 $ 30,131 $ 138,077 $ 130,775 $ 132,906