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BUSINESS SEGMENT INFORMATION - Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | $ 28,549 |  | $ 27,416 |  | $ 54,435 | $ 51,960 |
Depreciation and Amortization |  | 3,414 |  | 3,425 |  | 6,771 | 6,889 |
Property and other taxes |  | 1,603 |  | 1,524 |  | 3,288 | 3,130 |
Operating Income |  | 7,855 |  | 7,198 |  | 13,400 | 11,917 |
Assets |  | 819,296 |  |  |  | 819,296 |  | $ 798,623
Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Operating Income |  | 7,301 |  | 6,907 |  | 12,362 | 11,265 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | (65) |  | (58) |  | (128) | (118) |
Regulated Utility [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | 26,723 |  | 25,789 |  | 50,768 | 48,630 |
Payroll and Benefits | [2] | 6,183 | [1] | 6,254 | [1] | 12,394 | 12,612 |
Supply and Delivery | [2],[3] | 4,069 |  | 3,764 |  | 7,521 | 7,127 |
Administrative | [2],[4] | 2,318 |  | 2,220 |  | 5,043 | 4,515 |
Depreciation and Amortization | [2] | 3,401 |  | 3,412 |  | 6,745 | 6,863 |
Income Taxes | [2] | 1,866 |  | 1,725 |  | 3,450 | 3,151 |
Property and other taxes | [2] | 1,585 |  | 1,507 |  | 3,253 | 3,097 |
Operating Income | [2] | 7,301 |  | 6,907 |  | 12,362 | 11,265 |
Assets |  | 815,090 |  |  |  | 815,090 |  | 793,118
Reportable Segment, Aggregation before Other Operating Segment [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | 28,549 |  | 27,416 |  | 54,435 | 51,960 |
Reportable Segment, Aggregation before Other Operating Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | 26,723 |  | 25,789 |  | 50,768 | 48,630 |
Operating Income | [2] | 7,301 |  | 6,907 |  | 12,362 | 11,265 |
Assets |  | 815,090 |  |  |  | 815,090 |  | 793,118
Other Operating Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues | [5] | 1,891 |  | 1,685 |  | 3,795 | 3,448 |
Operating Income | [5] | 554 |  | $ 291 |  | 1,038 | $ 652 |
Assets |  | $ 4,206 |  |  |  | $ 4,206 |  | $ 5,505
[1] | Payroll and benefits: – This category does not include amounts capitalized on the Condensed Consolidated Balance Sheet
[2] | Significant expense categories: – 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] | Other revenues and other profit: – 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

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