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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
REVENUE RECOGNITION [Abstract] |  |  |  |  |  |
Minimum number of days for accounts receivable from tariff contract customers |  |  | 25 days |  |  |
Adjustment in reserve for bad debt |  |  |  |  | $ (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 | $ 628 | $ 432 | $ 1,521 | $ 1,046 |  |
Total Operating Revenues | 24,987 | 24,737 | 68,284 | 66,390 |  |
Tariff Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 22,721 | 22,936 | 62,099 | 61,268 |  |
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 13,595 | 13,875 | 36,672 | 36,217 |  |
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 7,112 | 6,797 | 20,983 | 20,192 |  |
Tariff Revenue [Member] | Service Charges [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 130 | 21 | 450 | 183 |  |
Tariff Revenue [Member] | DSIC [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 1,387 | 1,392 | 3,876 | 3,810 |  |
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 497 | 851 | 118 | 866 |  |
Non-Tariff Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 1,638 | 1,369 | 4,664 | 4,076 |  |
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 1,181 | 1,099 | 3,411 | 3,267 |  |
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 210 | 207 | 658 | 636 |  |
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | 139 | 0 | 351 | 0 |  |
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |
Total Operating Revenues | $ 108 | $ 63 | $ 244 | $ 173 |  |

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