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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
REVENUE RECOGNITION [Abstract] |  |  |  |
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 | $ 314 | $ 325 | $ 615 | $ 599
Total Operating Revenue | 20,652 | 20,238 | 40,037 | 39,144
Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 18,918 | 18,533 | 36,601 | 35,815
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 11,505 | 11,991 | 21,476 | 22,787
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 6,349 | 6,374 | 12,997 | 12,704
Tariff Revenue [Member] | Service Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 156 | 168 | 333 | 324
Tariff Revenue [Member] | DSIC [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 908 | 800 | 1,795 | 1,548
Tariff Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 0 | (800) | 0 | (1,548)
Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 1,420 | 1,380 | 2,821 | 2,730
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 1,028 | 996 | 2,079 | 1,978
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 328 | 337 | 656 | 696
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | $ 64 | $ 47 | $ 86 | $ 56

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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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- Definition The total amount of revenue recognized for the period from rental income and other revenue. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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