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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
REVENUE RECOGNITION [Abstract] |  |  |  |
Minimum number of days due for accounts receivable from regulated 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 | $ 325 | $ 259 | $ 599 | $ 483
Total Operating Revenue | 20,238 | 20,502 | 39,144 | 39,691
Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 18,533 | 18,921 | 35,815 | 36,554
Regulated Revenue [Member] | Consumption Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 11,919 | 11,790 | 22,638 | 22,195
Regulated Revenue [Member] | Fixed Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 6,447 | 6,102 | 12,853 | 12,302
Regulated Revenue [Member] | Service Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 167 | 242 | 324 | 514
Regulated Revenue [Member] | DSIC [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 800 | 787 | 1,548 | 1,543
Regulated Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | (800) | 0 | (1,548) | 0
Non-Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 1,380 | 1,322 | 2,730 | 2,654
Non-Regulated Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 996 | 950 | 1,978 | 1,904
Non-Regulated Revenue [Member] | Contract Operations [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | 337 | 327 | 696 | 655
Non-Regulated Revenue [Member] | Inspection Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Operating Revenue | $ 47 | $ 45 | $ 56 | $ 95

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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