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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 1 (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Subsidiary | Dec. 31, 2019 USD ($) | Dec. 31, 2018 | Aug. 03, 2020 USD ($)
Utility Subsidiary Accounting [Abstract] |  |  |  |
Number of wholly owned subsidiaries | Subsidiary | 5 |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 707,030 | $ 667,309 |  |
Less - accumulated depreciation | 147,469 | 136,588 |  |
Utility plant, net | $ 559,561 | $ 530,721 |  |
Depreciation and Amortization [Abstract] |  |  |  |
Depreciation rates of water utility plant | 2.23% | 2.27% | 2.28% |
Minimum [Member] |  |  |  |
Depreciation and Amortization [Abstract] |  |  |  |
Amortization period of other deferred assets | 20 years |  |  |
Maximum [Member] |  |  |  |
Depreciation and Amortization [Abstract] |  |  |  |
Amortization period of other deferred assets | 24 years |  |  |
Property Held for Future Use [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 0 years |  |  |
Utility plant, gross | $ 5,711 | $ 24,632 |  |
Construction in Progress [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 0 years |  |  |
Utility plant, gross | $ 21,474 | 31,881 |  |
Source of supply plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, net |  |  |  | $ 201
Pumping and water treatment plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, net |  |  |  | $ 1,455
Utility plant in service-Water [Member] | Mains [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 81 years |  |  |
Utility plant, gross | $ 293,643 | 277,125 |  |
Utility plant in service-Water [Member] | Services [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 39 years |  |  |
Utility plant, gross | $ 49,937 | 48,190 |  |
Utility plant in service-Water [Member] | Storage Tanks [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 76 years |  |  |
Utility plant, gross | $ 29,946 | 27,968 |  |
Utility plant in service-Water [Member] | Meters [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 26 years |  |  |
Utility plant, gross | $ 27,994 | 27,498 |  |
Utility plant in service-Water [Member] | Hydrants [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 60 years |  |  |
Utility plant, gross | $ 15,895 | 15,071 |  |
Utility plant in service-Water [Member] | Intangible plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 0 years |  |  |
Utility plant, gross | $ 140 | 140 |  |
Utility plant in service-Water [Member] | Source of supply plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 23,940 | 22,611 |  |
Utility plant in service-Water [Member] | Source of supply plant [Member] | Minimum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 45 years |  |  |
Utility plant in service-Water [Member] | Source of supply plant [Member] | Maximum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 85 years |  |  |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 100,317 | 90,795 |  |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Minimum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 8 years |  |  |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Maximum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 62 years |  |  |
Utility plant in service-Water [Member] | General plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 62,379 | 61,512 |  |
Utility plant in service-Water [Member] | General plant [Member] | Minimum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 5 years |  |  |
Utility plant in service-Water [Member] | General plant [Member] | Maximum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 31 years |  |  |
Utility plant in service-Wastewater [Member] | Intangible plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 0 years |  |  |
Utility plant, gross | $ 116 | 0 |  |
Utility plant in service-Wastewater [Member] | General plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 1,545 | 1,223 |  |
Utility plant in service-Wastewater [Member] | General plant [Member] | Minimum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 5 years |  |  |
Utility plant in service-Wastewater [Member] | General plant [Member] | Maximum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 31 years |  |  |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Utility plant, gross | $ 41,860 | 19,315 |  |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Minimum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 21 years |  |  |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Maximum [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 81 years |  |  |
Utility plant in service-Wastewater [Member] | Collection Mains & Lift Stations [Member] |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |
Estimated useful life | 81 years |  |  |
Utility plant, gross | $ 32,133 | $ 19,348 |  |
Artesian Water [Member] |  |  |  |
Utility Plant [Abstract] |  |  |  |
Capitalized rate of AFUDC | 7.00% | 7.10% | 7.40% |
Artesian Wastewater [Member] |  |  |  |
Utility Plant [Abstract] |  |  |  |
Capitalized rate of AFUDC | 6.30% | 7.10% | 5.90% |

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