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ACCOUNTS RECEIVABLE - Changes in Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
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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