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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | 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) |  | $ (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 | 514 | $ 324 | $ 894 | $ 616 |
Total Operating Revenues | 22,562 | 21,752 | 43,297 | 41,653 |
Tariff Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 20,583 | 20,128 | 39,378 | 38,331 |
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 12,660 | 12,182 | 23,078 | 22,342 |
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 6,872 | 6,657 | 13,871 | 13,394 |
Tariff Revenue [Member] | Service Charges [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 119 | 15 | 320 | 162 |
Tariff Revenue [Member] | DSIC [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 1,316 | 1,267 | 2,488 | 2,418 |
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | (384) | 7 | (379) | 15 |
Non-Tariff Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 1,465 | 1,300 | 3,025 | 2,706 |
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 1,134 | 1,079 | 2,230 | 2,167 |
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 217 | 213 | 447 | 429 |
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | 62 | 0 | 212 | 0 |
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenues | $ 52 | $ 8 | $ 136 | $ 110 |

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