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Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) County System | Dec. 31, 2022 USD ($)
Significant Accounting Policies [Abstract] |  |
Number of wastewater collection systems operated | System | 3 |
Number of wastewater collection and treatment systems operated | System | 10 |
Number of counties in which franchised territory is located | County | 4 |
Utility Plant and Depreciation [Abstract] |  |
Utility plant acquisition adjustments | $ 9,384 | $ 9,178
Amortization of utility plant acquisition adjustments | 69 | 67
Utility plant | $ 620,201 | $ 549,141
Effective rate of depreciation | 2.55% | 2.38%
Mains and Accessories [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 286,993 | $ 265,033
Mains and Accessories [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 13 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 | $ 98,387 | 92,818
Services, Meters, and Hydrants [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 14 years |
Services, Meters, and Hydrants [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 47 years |
Operations Structures, Reservoirs, and Water Tanks [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 89,207 | 87,218
Operations Structures, Reservoirs, and Water Tanks [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 10 years |
Operations Structures, Reservoirs, and Water Tanks [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 55 years |
Pumping and Treatment Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 44,719 | 40,038
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 | 35 years |
Office, Transportation, and Operating Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 19,292 | 18,128
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 | 20 years |
Land and Other Non-Depreciable Assets [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 5,685 | 3,938
Utility Plant in Service [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | 544,283 | 507,173
Construction Work in Progress [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 75,918 | $ 41,968

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