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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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