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REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
REVENUE RECOGNITION [Abstract]
Revenues	$ 30,491	$ 29,142	$ 84,926	$ 81,102
Other Operating Revenue not in scope of ASC 606	540	421	1,605	1,197
Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	27,803	26,876	77,103	74,430
Non-Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	2,148	1,845	6,218	5,475
Consumption Charges [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	17,131	16,747	45,607	44,232
Fixed Fees [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	9,725	9,156	28,325	27,578
Service Charges [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	186	186	544	565
DSIC [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	0	67	534	67
Metered Wastewater Services [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	229	253	629	598
Industrial Wastewater Services [Member] | Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	532	467	1,464	1,390
Service Line Protection Plans [Member] | Non-Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	1,643	1,468	4,889	4,323
Contract Operations [Member] | Non-Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	255	255	757	760
Design and Installation [Member] | Non-Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	4	2	11	61
Inspection Fees [Member] | Non-Tariff Revenue [Member]
REVENUE RECOGNITION [Abstract]
Revenues	$ 246	$ 120	$ 561	$ 331

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