Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) County System	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Abstract]
Number of wastewater collection systems operated \| System	3
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	$ 3,637	$ 3,707
Amortization of utility plant acquisition adjustments	67	67
Utility plant	$ 485,750	$ 438,670
Effective rate of depreciation	2.33%	2.33%
Mains and Accessories [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 242,160	$ 212,164
Mains and Accessories [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	11 years
Mains and Accessories [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	85 years
Services, Meters and Hydrants [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 87,164	80,590
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	$ 73,462	65,617
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	57 years
Pumping and Treatment Equipment [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 37,209	34,163
Pumping and Treatment Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	5 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	$ 16,856	15,520
Office, Transportation and Operating Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	2 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	$ 3,714	3,478
Utility Plant in Service [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	460,565	411,532
Construction Work in Progress [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 25,185	$ 27,138

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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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