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ACCOUNTS RECEIVABLE - Changes in Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | $ 8,567 | $ 11,682 | $ 13,158
Less: provision for expected credit loss | 406 | 343 | 328
Net accounts receivable | 8,161 | 11,339 | 12,830
Customer Accounts Receivable - Water [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | 6,706 | 6,824 | 6,573
Customer Accounts Receivable - Wastewater [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | 749 | 928 | 869
Customer Accounts Receivable - SLP Plan [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | 457 | 470 | 409
Settlement Agreement Receivable - Short Term [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable |  | 2,523 | 2,747
Developer Receivable [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | 518 | 837 | 2,089
Miscellaneous Receivable [Member] |  |  |
ACCOUNTS RECEIVABLE [Abstract] |  |  |
Gross accounts receivable | $ 137 | $ 100 | $ 471

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