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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
REVENUE RECOGNITION [Abstract] |  |  |
Reserve (refund liability) | $ 3,300 |  |
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 | $ 1,272 | $ 1,144 |
Total Operating Revenue | 80,411 | 82,235 | $ 79,089
Tariff Revenue [Member] |  |  |
REVENUE RECOGNITION [Abstract] |  |  |
Reserve (refund liability) | 3,298 | 0 |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 73,584 | 75,748 |
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 47,903 | 46,669 |
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 25,401 | 24,998 |
Tariff Revenue [Member] | Service Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 717 | 921 |
Tariff Revenue [Member] | DSIC [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 2,797 | 3,160 |
Tariff Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | (3,234) | 0 |
Non-Tariff Revenue [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 5,555 | 5,343 |
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 3,992 | 3,858 |
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | 1,352 | 1,315 |
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Total Operating Revenue | $ 211 | $ 170 |

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- 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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- Definition 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. + References No definition available. + Details
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