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BUSINESS COMBINATIONS (Details) $ in Thousands | Aug. 03, 2020 USD ($) Customer | Apr. 02, 2020 USD ($) Customer | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Summary of utility plant comprises [Abstract] |  |  |  |  |
Utility plant, at original cost |  |  | $ 559,561 | $ 530,721 |
Goodwill | $ 623 |  | $ 623 | $ 0 | $ 0
Purchase price | 5,741 |  |  |  |
Source of supply plant [Member] |  |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |  |
Utility plant, at original cost | 201 |  |  |  |
Pumping and water treatment plant [Member] |  |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |  |
Utility plant, at original cost | 1,455 |  |  |  |
Transmission and distribution plant [Member] |  |  |  |  |
Summary of utility plant comprises [Abstract] |  |  |  |  |
Utility plant, at original cost | $ 3,462 |  |  |  |
Frankford [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Number of customers | Customer |  | 360 |  |  |
Total purchase price |  | $ 3,600 |  |  |
Delaware City [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Number of customers | Customer | 800 |  |  |  |
Total purchase price | $ 2,100 |  |  |  |

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