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REVENUE RECOGNITION, Disaggregated Revenues (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) Contract | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
REVENUE RECOGNITION [Abstract] |  |  |
Minimum number of days due for accounts receivable from tariff contract customers | 25 days |  |
Reserve or reduction to revenue | $ 0 | $ 0 |
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 |  |
Number of operation contracts paid in advance | Contract | 1 |  |
Disaggregation of Revenue [Abstract] |  |  |
Other Operating Revenue not in scope of ASC 606 | $ 1,591 | 1,881 | $ 2,230
Revenue from acquisition | 98,861 | 98,897 | 90,859
Tariff Revenue [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 89,987 | 87,424 | 82,248
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 49,051 | 47,809 | 47,924
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 33,074 | 31,431 | 27,977
Tariff Revenue [Member] | Service Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 682 | 597 | 579
Tariff Revenue [Member] | DSIC [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 4,727 | 5,085 | 5,093
Tariff Revenue [Member] | Metered Wastewater Services [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 602 | 649 | 0
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 1,851 | 1,853 | 675
Non-Tariff Revenue [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 7,283 | 9,592 | 6,381
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 5,632 | 5,020 | 4,594
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 1,046 | 931 | 884
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 181 | 3,315 | 562
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | $ 424 | $ 326 | $ 341

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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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