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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
REVENUE RECOGNITION [Abstract] |  |  |  |  |
Refund to customers through reduced tariff rates |  |  | $ (3,800) |  |
Minimum number of days for accounts receivable from tariff contract customers |  |  |  | 25 days |
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 | $ 381 | $ 338 |  | $ 993 | $ 936
Total Operating Revenue | 22,549 | 21,924 |  | 62,586 | 61,068
Tariff Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 20,850 | 20,160 |  | 57,455 | 55,976
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 12,844 | 13,672 |  | 34,320 | 36,459
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 6,529 | 6,305 |  | 19,525 | 19,009
Tariff Revenue [Member] | Service Charges [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 133 | 183 |  | 467 | 508
Tariff Revenue [Member] | DSIC [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 1,334 | 655 |  | 3,129 | 2,203
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 10 | 0 |  | 14 | 0
Tariff Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 0 | (655) |  | 0 | (2,203)
Non-Tariff Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 1,318 | 1,426 |  | 4,138 | 4,156
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 1,039 | 982 |  | 3,117 | 2,960
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | 210 | 329 |  | 866 | 1,025
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total Operating Revenue | $ 69 | $ 115 |  | $ 155 | $ 171

X
- Definition Minimum number of days services invoiced in advance beginning of every month for customer, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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