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Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) System County | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Abstract] |  |
Number of wastewater collection systems operated | System | 2 |
Number of wastewater collection and treatment systems operated | System | 5 |
Number of counties in which franchised territory is located | County | 3 |
Utility Plant and Depreciation [Abstract] |  |
Utility plant acquisition adjustments | $ 3,707 | $ 3,318
Amortization of utility plant acquisition adjustments | 67 | 61
Utility plant | $ 438,670 | $ 401,383
Effective rate of depreciation | 2.33% | 2.29%
Mains and Accessories [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 212,164 | $ 200,954
Mains and Accessories [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 10 years |
Mains and Accessories [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 86 years |
Services, Meters and Hydrants [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 80,590 | 77,501
Services, Meters and Hydrants [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 17 years |
Services, Meters and Hydrants [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 51 years |
Operations Structures, Reservoirs and Water Tanks [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 65,617 | 63,530
Operations Structures, Reservoirs and Water Tanks [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 9 years |
Operations Structures, Reservoirs and Water Tanks [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 58 years |
Pumping and Treatment Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 34,163 | 33,124
Pumping and Treatment Equipment [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 6 years |
Pumping and Treatment Equipment [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 30 years |
Office, Transportation and Operating Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 15,520 | 14,464
Office, Transportation and Operating Equipment [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 3 years |
Office, Transportation and Operating Equipment [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 22 years |
Land and Other Non-Depreciable Assets [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 3,478 | 3,393
Utility Plant in Service [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | 411,532 | 392,966
Construction Work in Progress [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 27,138 | $ 8,417

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