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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ServiceLine	Dec. 31, 2020 USD ($)	Dec. 31, 2014 USD ($)
Assets [Abstract]
Regulatory assets	$ 45,280	$ 39,893
Liabilities [Abstract]
Regulatory liabilities	36,981	25,969
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member]
Liabilities [Abstract]
Regulatory liabilities	13,644	13,826
Postretirement Benefits [Member]
Liabilities [Abstract]
Regulatory liabilities	11,870	25
Income Taxes [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 8,314	8,706
Income Taxes [Member] | Minimum [Member]
Liabilities [Abstract]
Remaining recovery period	1 year
Income Taxes [Member] | Maximum [Member]
Liabilities [Abstract]
Remaining recovery period	50 years
IRS TPR Catch-Up Deduction [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 3,153	3,412	$ 3,887
Remaining recovery period	12 years
Approved amortization period	15 years
Income Taxes [Member]
Assets [Abstract]
Regulatory assets	$ 33,255	28,200
Unrealized Swap Losses [Member]
Assets [Abstract]
Regulatory assets	$ 2,054	2,700
Unrealized Swap Losses [Member] | Minimum [Member]
Assets [Abstract]
Remaining recovery period	1 year
Unrealized Swap Losses [Member] | Maximum [Member]
Assets [Abstract]
Remaining recovery period	8 years
Utility Plant Retirement Costs [Member]
Assets [Abstract]
Regulatory assets	$ 7,245	5,968
Remaining recovery period	5 years
Customer-Owned Lead Service Line Replacements [Member]
Assets [Abstract]
Regulatory assets	$ 1,161	1,081
Remaining recovery period	4 years
Term of tariff modification to replace customer-owned lead service lines connected to company-owned lead service lines	3 years
Number of lead customer-owned service lines to be replaced annually | ServiceLine	400
Term of tariff modification to replace customer-owned lead service lines	9 years
Income Taxes on Customers' Advances for Construction and Contributions in Aid of Construction [Member]
Assets [Abstract]
Regulatory assets	$ 1,545	1,815
Service Life Study Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 3	8
Remaining recovery period	1 year
Rate Case Filing Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 17	$ 121
Remaining recovery period	1 year

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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