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REGULATORY LIABILITIES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2021	Jan. 31, 2019
REGULATORY LIABILITIES [Abstract]
Federal corporate tax rate	21.00%	34.00%
Decrease in the net deferred income tax liability	$ 24,300
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 21,732	$ 22,800	$ 21,260
DEPSC [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities				$ 22,200
Regulatory liabilities, amortization period	49 years 6 months
MDPSC [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 600
Utility Plant Retirement Cost Obligation [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	158		149
Deferred Income Taxes [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 21,574		$ 21,111

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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

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Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

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