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REGULATORY PROCEEDINGS (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Nov. 20, 2020 | May 29, 2020 | Nov. 15, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Other Proceedings [Abstract] |  |  |  |  |
Cumulative DSIC Rate | 7.50% | 7.41% | 7.50% |  |
Net Eligible Plant Improvements - Cumulative Dollars | $ 43.1 | $ 43.1 | $ 43.1 |  |
Delaware [Member] |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |
Percentage of gross water sales |  |  |  | 15.00% |
Period to complete rate case by law |  |  |  | 7 months |
Delaware [Member] | Maximum [Member] |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |
Temporary annual rate increase subject to 15% gross water sales limitation |  |  |  | $ 2.5 |
Percentage of rate relief allowed should a rate case not complete |  |  |  | 15.00% |
Other Proceedings [Abstract] |  |  |  |  |
Distribution System Improvement Charge rate increase applied between base rate filings |  |  |  | 7.50% |
Distribution System Improvement Charge rate increase within a 12-month period |  |  |  | 5.00% |
Artesian Water [Member] |  |  |  |  |
Other Proceedings [Abstract] |  |  |  |  |
Revenue earned in DSIC rate increases |  |  |  | $ 1.2 | $ 1.2

X
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