Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) System County	Dec. 31, 2024 USD ($)
Significant Accounting Policies [Abstract]
Number of wastewater collection systems operated | System	3
Number of wastewater collection and treatment systems operated | System	12
Number of counties in which franchised territory is located | County	4
Utility Plant and Depreciation [Abstract]
Utility plant acquisition adjustments	$ 9,761	$ 9,838
Amortization of utility plant acquisition adjustments	77	79
Utility plant	$ 711,121	$ 664,927
Effective rate of depreciation	2.45%	2.50%
Mains and Accessories [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 336,517	$ 308,020
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	$ 114,894	106,200
Services, Meters, and Hydrants [Member] | Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	15 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	$ 145,645	143,821
Operations Structures, Reservoirs, and Water Tanks [Member] | Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	8 years
Operations Structures, Reservoirs, and Water Tanks [Member] | Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	70 years
Pumping and Treatment Equipment [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 53,704	51,906
Pumping and Treatment Equipment [Member] | Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	7 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	$ 21,578	20,519
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	21 years
Land and Other Non-Depreciable Assets [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 5,845	5,833
Utility Plant in Service [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	678,183	636,299
Construction Work in Progress [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 32,938	$ 28,628