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BUSINESS SEGMENT INFORMATION - Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | $ 30,491 |  | $ 29,142 |  | $ 84,926 | $ 81,102 |
Depreciation and Amortization |  | 3,497 |  | 3,287 |  | 10,268 | 10,177 |
Property and other taxes |  | 1,206 |  | 1,572 |  | 4,494 | 4,700 |
Operating Income |  | 8,619 |  | 8,590 |  | 22,019 | 20,508 |
Assets |  | 833,908 |  |  |  | 833,908 |  | $ 798,623
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | (64) |  | (59) |  | (192) | (176) |
Regulated Utility [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | 28,617 |  | 27,450 |  | 79,385 | 76,080 |
Payroll and Benefits | [2] | 6,873 | [1] | 6,160 | [1] | 19,266 | 18,772 |
Supply and Delivery | [2],[3] | 4,066 |  | 3,640 |  | 11,587 | 10,767 |
Administrative | [2],[4] | 2,557 |  | 2,384 |  | 7,600 | 6,899 |
Depreciation and Amortization | [2] | 3,484 |  | 3,274 |  | 10,229 | 10,137 |
Income Taxes | [2] | 2,229 |  | 2,147 |  | 5,680 | 5,297 |
Property and other taxes | [2] | 1,188 |  | 1,556 |  | 4,442 | 4,653 |
Operating Income | [2] | 8,220 |  | 8,289 |  | 20,581 | 19,555 |
Assets |  | 829,477 |  |  |  | 829,477 |  | 793,118
Reportable Segment, Aggregation before Other Operating Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues |  | 28,617 |  | 27,450 |  | 79,385 | 76,080 |
Operating Income | [2] | 8,220 |  | 8,289 |  | 20,581 | 19,555 |
Assets |  | 829,477 |  |  |  | 829,477 |  | 793,118
Other Operating Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |
Revenues | [5] | 1,938 |  | 1,751 |  | 5,733 | 5,198 |
Operating Income | [5] | 399 |  | $ 301 |  | 1,438 | $ 953 |
Assets |  | $ 4,431 |  |  |  | $ 4,431 |  | $ 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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