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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 19, 2022 USD ($) Installment | Jul. 31, 2023 USD ($) | Aug. 31, 2022 USD ($) | Jan. 31, 2017 | Dec. 31, 2023 USD ($) Installment Refund | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Jan. 31, 2019 USD ($)
Amortization period of other regulatory expense [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred contract costs and other |  |  |  |  | 5 years |  |  |  |  |
Rate case studies |  |  |  |  | 5 years |  |  |  |  |
Deferred costs affiliated interest agreement |  |  |  |  | 20 years |  |  |  |  |
Goodwill |  |  |  |  | 50 years |  |  |  |  |
Deferred acquisition costs |  |  |  |  | 20 years |  |  |  |  |
Franchise costs |  |  |  |  | 80 years |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | $ 7,289 | $ 7,274 |  |  |  |
Impairment or Disposal of Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  | 0 | 0 | $ 0 |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,939 | 1,939 |  |  |  |
Summary of other deferred assets net of amortization [Abstract] |  |  |  |  |  |  |  |  |  |
Investment in Co Bank |  |  |  |  | 5,882 | 5,351 |  |  |  |
Settlement agreement receivable-long term |  |  |  |  | 2,496 | 4,991 |  |  |  |
Other deferred assets |  |  |  |  | 126 | 194 |  |  |  |
Other deferred assets |  |  |  |  | 8,504 | 10,536 |  |  |  |
Contributions in Aid of Construction [Abstract] |  |  |  |  |  |  |  |  |  |
Refund for contributions in aid of construction due to tax status change |  |  |  |  |  | $ 3,600 |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement amount | $ 10,000 |  |  |  | 10,000 |  |  |  |  |
Litigation settlement amount received |  | $ 2,500 | $ 2,500 |  |  |  |  |  |  |
Litigation settlement, remaining amount |  |  |  |  | $ 5,000 |  |  |  |  |
Number of installments | Installment | 2 |  |  |  | 2 |  |  |  |  |
Number of refunds | Refund |  |  |  |  | 2 |  |  |  |  |
Federal corporate tax rate |  |  |  |  | 21.00% | 21.00% | 21.00% |  | 34.00% |
Decrease in the net deferred income tax liability |  |  |  |  |  |  |  | $ (24,300) |  |
Net regulatory liability amount |  |  |  |  |  |  |  | $ 22,800 |  |
Regulatory Liabilities |  |  |  |  | $ 25,676 | $ 28,721 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |  |  |  |  |  |  |
Amortization period of debt related cost |  |  |  | 15 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |  |  |  |  |  |  |
Amortization period of debt related cost |  |  |  | 30 years |  |  |  |  |  |
Maryland [Member] |  |  |  |  |  |  |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |  |  |  |  |  |  |
Rate proceedings |  |  |  |  | 5 years |  |  |  |  |
Delaware [Member] |  |  |  |  |  |  |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |  |  |  |  |  |  |
Rate proceedings |  |  |  |  | 3 years |  |  |  |  |
DEPSC [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Net regulatory liability amount |  |  |  |  |  |  |  |  |  | $ 22,200
Regulatory liabilities, amortization period |  |  |  |  | 49 years 6 months |  |  |  |  |
MDPSC [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Net regulatory liability amount |  |  |  |  | $ 600 |  |  |  |  |
Artesian Water [Member] |  |  |  |  |  |  |  |  |  |
Contributions in Aid of Construction [Abstract] |  |  |  |  |  |  |  |  |  |
Amount received in grant |  |  |  |  | 3,800 | 2,000 |  |  |  |
Deferred Settlement Refunds [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  |  | 5,000 | 7,500 |  |  |  |
Deferred Income Taxes [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  |  | 20,700 | 21,200 |  |  |  |
Deferred Contract Costs and Other [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 209 | 227 |  |  |  |
Rate Case Studies [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 136 | 57 |  |  |  |
Rate Proceedings [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 385 | 0 |  |  |  |
Deferred Income Taxes [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 444 | 465 |  |  |  |
Debt Related Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 4,322 | 4,682 |  |  |  |
Deferred Costs Affiliated Interest Agreement [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 1,110 | 1,114 |  |  |  |
Goodwill [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | 258 | 266 |  |  |  |
Deferred Acquisition and Franchise Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets, net |  |  |  |  | $ 425 | $ 463 |  |  |  |

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