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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
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 | $ 379 | $ 291
Total Operating Revenues | 20,736 | 19,901
Tariff Revenue [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 18,796 | 18,204
Tariff Revenue [Member] | Consumption Charges [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 10,418 | 10,160
Tariff Revenue [Member] | Fixed Fees [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 6,999 | 6,737
Tariff Revenue [Member] | Service Charges [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 201 | 147
Tariff Revenue [Member] | DSIC [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 1,172 | 1,152
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 6 | 8
Non-Tariff Revenue [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 1,561 | 1,406
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 1,096 | 1,088
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 230 | 216
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | 151 | 0
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Total Operating Revenues | $ 84 | $ 102

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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