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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jun. 30, 2021
REVENUE RECOGNITION [Abstract]
Minimum number of days for accounts receivable from tariff contract customers	25 days
Adjustment in reserve for bad debt			$ 500	$ (300)
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	$ 361	$ 288
Total Operating Revenues	22,187	20,645
Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	20,229	18,796
Tariff Revenue [Member] | Consumption Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	10,566	10,418
Tariff Revenue [Member] | Fixed Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	7,778	6,999
Tariff Revenue [Member] | Service Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	156	201
Tariff Revenue [Member] | DSIC [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,182	1,172
Tariff Revenue [Member] | Metered Wastewater Services [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	140	0
Tariff Revenue [Member] | Industrial Wastewater Services [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	407	6
Non-Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,597	1,561
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,222	1,096
Non-Tariff Revenue [Member] | Contract Operations [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	211	230
Non-Tariff Revenue [Member] | Design and Installation [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	123	151
Non-Tariff Revenue [Member] | Inspection Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	$ 41	$ 84

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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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