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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
REVENUE RECOGNITION [Abstract]
Minimum number of days for accounts receivable from tariff contract customers			25 days
Adjustment in reserve for bad debt		$ (300)		$ (300)	$ 500
Minimum number of days due for accounts receivable from SLP Plan customer			25 days
Minimum number of days customers services invoiced in advance			30 days
Disaggregation of Revenue [Abstract]
Other Operating Revenue not in scope of ASC 606	$ 605	421	$ 967	710
Total Operating Revenues	25,011	22,469	47,198	43,113
Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	21,903	20,583	42,132	39,378
Tariff Revenue [Member] | Consumption Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	12,182	12,660	22,749	23,078
Tariff Revenue [Member] | Fixed Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	7,751	6,872	15,529	13,871
Tariff Revenue [Member] | Service Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	137	119	293	320
Tariff Revenue [Member] | DSIC [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,282	1,316	2,464	2,488
Tariff Revenue [Member] | Metered Wastewater Services [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	129	0	269	0
Tariff Revenue [Member] | Industrial Wastewater Services [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	422	(384)	828	(379)
Non-Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	2,503	1,465	4,099	3,025
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,217	1,134	2,439	2,230
Non-Tariff Revenue [Member] | Contract Operations [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	242	217	453	447
Non-Tariff Revenue [Member] | Design and Installation [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	978	62	1,101	212
Non-Tariff Revenue [Member] | Inspection Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	$ 66	$ 52	$ 106	$ 136

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The minimum number of days due for accounts receivable after invoicing from regulated contract customers, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The minimum number of days due for accounts receivable after invoicing from Service Line Protection Plans (SLP) customers, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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