SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) Installment Refund	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Jun. 12, 2024 USD ($)	Jan. 31, 2019 USD ($)
Reclassification of deferred acquisition costs [Abstract]
Reclassification of deferred acquisition costs from net utility plant									$ 3,700
Reclassification of deferred acquisition costs from contributions in aid of construction									$ 100
Amortization period of other regulatory expense [Abstract]
Deferred contract costs and other				5 years
Amortization period				5 years
Deferred costs affiliated interest agreement				20 years
Goodwill				50 years
Unrecovered reserve for depreciation (general plant assets)				5 years
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 14,428	$ 7,289
Impairment or Disposal of Long-Lived Assets [Abstract]
Impairment				0	0	$ 0
Goodwill [Abstract]
Goodwill				1,939	1,939
Summary of other deferred assets net of amortization [Abstract]
Investment in Co Bank				6,425	5,882
Settlement agreement receivable-long term				0	2,496
Other deferred assets				100	126
Other deferred assets				6,525	$ 8,504
Regulatory Liabilities [Line Items]
Litigation settlement amount				10,000
Litigation settlement amount received	$ 2,500	$ 2,500	$ 2,500
Litigation settlement, remaining amount				$ 2,500
Number of installments | Installment				3
Number of refunds | Refund				3
Federal corporate tax rate				21.00%	21.00%	21.00%		34.00%
Decrease in the net deferred income tax liability							$ (24,300)
Net regulatory liability amount							$ 22,800
Regulatory Liabilities				$ 30,267	$ 25,676
Minimum [Member]
Amortization period of other regulatory expense [Abstract]
Debt related costs				15 years
Deferred acquisition and franchise costs - Maryland				20 years
Maximum [Member]
Amortization period of other regulatory expense [Abstract]
Debt related costs				30 years
Deferred acquisition and franchise costs - Maryland				80 years
Delaware [Member]
Amortization period of other regulatory expense [Abstract]
Rate proceedings				3 years
Deferred acquisition costs				20 years
Delaware [Member] | Minimum [Member]
Amortization period of other regulatory expense [Abstract]
Deferred acquisition adjustments				36 years
Delaware [Member] | Maximum [Member]
Amortization period of other regulatory expense [Abstract]
Deferred acquisition adjustments				62 years
DEPSC [Member]
Regulatory Liabilities [Line Items]
Net regulatory liability amount										$ 22,200
Regulatory liabilities, amortization period				49 years 6 months					6 years
Gross-up adjustment									$ 7,600
Regulatory Liabilities									4,000
MDPSC [Member]
Regulatory Liabilities [Line Items]
Net regulatory liability amount				$ 600
Artesian Water [Member]
Contributions in Aid of Construction [Abstract]
Amount received in grant				0	3,800
Deferred Contract Costs and Other [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 161	209
Rate Case Studies [Member]
Amortization period of other regulatory expense [Abstract]
Amortization period				5 years
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 141	166
Delaware Rate Proceedings [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				474	355
Deferred Income Taxes [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				423	444
Debt Related Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				3,969	4,322
Deferred Costs Affiliated Interest Agreement [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				1,054	1,110
Goodwill [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				251	258
Deferred Acquisition and Franchise Costs - Maryland [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				499	425
Deferred Acquisition Costs - Delaware [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				231	0
Deferred Acquisition Adjustments - Delaware [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				3,359	0
Unrecovered Reserve for Depreciation [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 3,866	$ 0				$ 4,300