REGULATORY LIABILITIES (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Jul. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Mar. 31, 2024 USD ($) Refund Installment	Dec. 31, 2017 USD ($)	Dec. 31, 2023 USD ($)	Jan. 31, 2019 USD ($)
REGULATORY LIABILITIES [Abstract]
Litigation settlement amount			$ 10,000
Litigation settlement amount received	$ 2,500	$ 2,500
Litigation settlement, remaining amount			$ 5,000
Number of installments | Installment			2
Number of upcoming installments | Installment			2
Number of refunds | Refund			2
Federal corporate tax rate			21.00%	34.00%
Decrease in the net deferred income tax liability				$ 24,300
Regulatory Liabilities [Abstract]
Regulatory liabilities			$ 26,166	$ 22,800	$ 25,676
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			487		0
Deferred Settlement Refunds [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities			4,991		4,991
Deferred Income Taxes [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities			$ 20,688		$ 20,685