REGULATORY ASSETS - Regulatory Assets, Net of Amortization, Comprise (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 13,593	$ 14,428
Deferred Contract Costs and Other [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	226	271
Rate Case Studies [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	123	141
Delaware Rate Proceedings [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	410	474
Deferred Income Taxes [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	413	423
Debt Related Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	3,793	3,969
Deferred Costs Affiliated Interest Agreement [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	1,026	1,054
Goodwill [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	247	251
Deferred Acquisition and Franchise Costs - Maryland [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	370	389
Deferred Acquisition Costs - Delaware [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	225	231
Deferred Acquisition Adjustments - Delaware [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	3,324	3,359
Unrecovered Reserve for Depreciation [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 3,436	$ 3,866