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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Regulated Tariff Sales |  |  |  |  |  |  |  |  |  |  |
Residential |  |  |  |  |  |  |  |  | $ 71,487 | $ 69,785 | $ 66,483
Commercial |  |  |  |  |  |  |  |  | 15,198 | 14,844 | 13,956
Industrial |  |  |  |  |  |  |  |  | 9,390 | 10,183 | 9,321
Fire Protection |  |  |  |  |  |  |  |  | 12,291 | 12,099 | 11,812
Wholesale |  |  |  |  |  |  |  |  | 14,319 | 14,655 | 13,553
Non-Regulated Contract Operations |  |  |  |  |  |  |  |  | 11,773 | 16,374 | 15,508
Total Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 134,458 | 137,940 | 130,633
Other Regulated Revenues |  |  |  |  |  |  |  |  | 393 | 335 | 329
Other Non-Regulated Revenues |  |  |  |  |  |  |  |  | 404 | 404 | 404
Inter-segment Elimination |  |  |  |  |  |  |  |  | (657) | (602) | (591)
Total Revenue | $ 32,738 | $ 37,769 | $ 33,393 | $ 30,698 | $ 33,268 | $ 38,713 | $ 34,919 | $ 31,177 | $ 134,598 | $ 138,077 | $ 130,775

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