BUSINESS SEGMENT INFORMATION (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2025 USD ($) Segment Subsidiary	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
BUSINESS SEGMENT INFORMATION [Abstract]
Number of reportable segments | Segment		1
Number of regulated utility subsidiaries | Subsidiary		5
Segment Reporting, Revenue [Abstract]
Revenues		$ 25,886	$ 24,544
Segment Reporting, Operating Income [Abstract]
Depreciation and amortization		3,357	3,465
Property and other taxes		1,686	1,606
Operating Income		5,546	4,719
Segment Reporting, Assets [Abstract]
Assets		808,852	798,623	$ 798,623
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues		(64)	(59)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues		24,045	22,840
Segment Reporting, Operating Income [Abstract]
Payroll and benefits expense	[1],[2]	6,210	6,358
Supply and delivery	[2],[3]	3,452	3,363
Administrative	[2],[4]	2,725	2,295
Depreciation and amortization	[2]	3,344	3,451
Income taxes	[2]	1,584	1,425
Property and other taxes	[2]	1,668	1,591
Operating Income	[2]	5,062	4,357
Segment Reporting, Assets [Abstract]
Assets		801,517	793,118
Other Operating Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	[5]	1,905	1,763
Segment Reporting, Operating Income [Abstract]
Operating Income	[5]	484	362
Segment Reporting, Assets [Abstract]
Assets		7,335	5,505
Reportable Segment, Aggregation before Other Operating Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues		24,045	22,840
Segment Reporting, Operating Income [Abstract]
Operating Income	[2]	5,062	4,357
Segment Reporting, Assets [Abstract]
Assets		$ 801,517	$ 793,118

[1] Payroll and benefits:

[2] – The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM– Inter-segment expenses related to leased space provided by one non-utility business, calculated on the lower of cost or market method, are included in the amounts shown 

[3] Supply and Delivery: – This category includes purchased power, purchased water, chemicals, infrastructure maintenance and repair costs, and wastewater disposal fees

[4] Administration expense:– This category includes computer systems maintenance and subscription fees, audit and legal fees, insurance, customer billing, and other general and administrative expenses

[5] – Revenue and profit from segments below the quantitative thresholds are attributable to four non-utility businesses of the Company– These businesses are primarily comprised of: Service Line Protection Plan services for water, sewer and internal plumbing; design, construction and engineering services; contract services for the operation and maintenance of water and wastewater systems in Delaware and Maryland; and leased space to the Regulated Utility Segment– These non-utility businesses do not individually or in the aggregate meet the quantitative thresholds for determining reportable segments– Certain corporate costs have been allocated from the regulated utility segment to the non-utility businesses and are included in the other profit amounts shown