Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands	12 Months Ended
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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities.

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Composite depreciation rate for public utility plants in service.

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Period end amount of total gross PPE.

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Number of counties in which the Company's franchised territory is located within south-central Pennsylvania.

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The number of wastewater treatment and collection systems operated by the entity.

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The number of wastewater collection systems operated by the entity.

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Amount of amortization of utility plant acquisition adjustments.

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