SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) $ in Thousands		1 Months Ended		12 Months Ended
	Jul. 19, 2022 USD ($) Installment	Aug. 31, 2022 USD ($)	Jan. 31, 2017	Dec. 31, 2022 USD ($) Installment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Jan. 31, 2019 USD ($)
Amortization period of other regulatory expense [Abstract]
Deferred contract costs and other				5 years
Rate case studies				5 years
Deferred costs affiliated interest agreement				20 years
Goodwill				50 years
Deferred acquisition costs				20 years
Franchise costs				80 years
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 7,274	$ 6,321
Impairment or Disposal of Long-Lived Assets [Abstract]
Impairment				0	0	$ 0
Goodwill [Abstract]
Goodwill				1,939	0	$ 0
Summary of other deferred assets net of amortization [Abstract]
Investment in Co Bank				5,351	4,850
Settlement agreement receivable-long term				4,991	0
Other deferred assets				194	247
Other deferred assets				10,536	$ 5,097
Contributions in Aid of Construction [Abstract]
Refund for contributions in aid of construction due to tax status change				3,600
Regulatory Liabilities [Line Items]
Litigation settlement amount	$ 10,000			10,000
Litigation settlement amount received		$ 2,500
Litigation settlement, remaining amount	$ 7,500			$ 7,500
Number of installments | Installment	3			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				$ 28,721	$ 21,260
Minimum [Member]
Amortization period of other regulatory expense [Abstract]
Amortization period of debt related cost			15 years
Maximum [Member]
Amortization period of other regulatory expense [Abstract]
Amortization period of debt related cost			30 years
Maryland [Member]
Amortization period of other regulatory expense [Abstract]
Rate proceedings				5 years
Delaware [Member]
Amortization period of other regulatory expense [Abstract]
Rate proceedings				2 years 6 months
DEPSC [Member]
Regulatory Liabilities [Line Items]
Net regulatory liability amount									$ 22,200
Regulatory liabilities, amortization period				49 years 6 months
MDPSC [Member]
Regulatory Liabilities [Line Items]
Net regulatory liability amount				$ 600
Artesian Water [Member]
Contributions in Aid of Construction [Abstract]
Amount received in grant				2,000
Eligible amount to be received in grant				3,800
Utility Plant Retirement Cost Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities				0	149
Deferred Settlement Refunds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities				7,487	0
Deferred Income Taxes [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities				21,234	21,111
Deferred Income Taxes [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				465	355
Deferred Contract Costs and Other [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				227	288
Debt Related Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				4,682	4,902
Goodwill [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				266	273
Deferred Costs Affiliated Interest Agreement [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				1,114	0
Deferred Acquisition and Franchise Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net				$ 520	$ 503