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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 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 | $ 274 | $ 225
Total Operating Revenue | 18,906 | 19,190
Regulated Revenue [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 17,282 | 17,633
Regulated Revenue [Member] | Consumption Charges [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 10,719 | 10,405
Regulated Revenue [Member] | Fixed Fees [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 6,406 | 6,200
Regulated Revenue [Member] | Service Charges [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 157 | 272
Regulated Revenue [Member] | DSIC [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 748 | 756
Regulated Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | (748) | 0
Non-Regulated Revenue [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 1,350 | 1,332
Non-Regulated Revenue [Member] | Service Line Protection Plans [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 982 | 953
Non-Regulated Revenue [Member] | Contract Operations [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | 359 | 328
Non-Regulated Revenue [Member] | Inspection Fees [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenue | $ 9 | $ 51

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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