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Significant Accounting Policies, Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Income Taxes [Abstract]
Deferred investment tax credits	$ 463	$ 500
Federal corporate tax rate	21.00%	21.00%	34.00%
IRS TPR Catch-Up Deduction [Member]
Income Taxes [Abstract]
Approved amortization period	15 years

X

- Definition

The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

Amortization period approved by regulatory agency for the recovery of regulatory asset or liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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