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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) ServiceLine	Dec. 31, 2019 USD ($)	Dec. 31, 2014 USD ($)
Assets [Abstract]
Regulatory assets	$ 39,893	$ 34,189
Liabilities [Abstract]
Regulatory liabilities	25,969	25,399
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member]
Liabilities [Abstract]
Regulatory liabilities	13,826	14,008
Income Taxes [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 8,706	7,494
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	$ 3,412	3,671	$ 3,887
Remaining recovery period	13 years
Postretirement Benefits [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 25	0
Revenue Reduction For Tax Rate Change [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 0	226
Term for negative surcharge on bills to customers	1 year
Income Taxes [Member]
Assets [Abstract]
Regulatory assets	$ 28,200	24,405
Postretirement Benefits [Member]
Assets [Abstract]
Regulatory assets	0	365
Unrealized Swap Losses [Member]
Assets [Abstract]
Regulatory assets	$ 2,700	2,227
Unrealized Swap Losses [Member] | Minimum [Member]
Assets [Abstract]
Remaining recovery period	1 year
Unrealized Swap Losses [Member] | Maximum [Member]
Assets [Abstract]
Remaining recovery period	9 years
Utility Plant Retirement Costs [Member]
Assets [Abstract]
Regulatory assets	$ 5,968	5,012
Remaining recovery period	5 years
Customer-Owned Lead Service Line Replacements [Member]
Assets [Abstract]
Regulatory assets	$ 1,081	944
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	$ 1,815	998
Service Life Study Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 8	13
Remaining recovery period	2 years
Rate Case Filing Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 121	$ 225
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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