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INCOME TAXES (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2019
Income Taxes [Abstract] |  |  |  |  |  |
Federal corporate tax rate | 21.00% | 21.00% | 21.00% |  | 34.00% |
Decrease in the net deferred income tax liability |  |  |  | $ (24,300,000) |  |
Net regulatory liability amount |  |  |  | $ 22,800,000 |  |
Income Tax Examination, Operating Loss Carryforwards [Abstract] |  |  |  |  |  |
Valuation allowance | $ 906,000 | $ 600,000 |  |  |  |
Federal income taxes [Abstract] |  |  |  |  |  |
Current | 1,946,000 | 2,912,000 | $ 2,144,000 |  |  |
Deferred | 1,968,000 | 930,000 | 1,601,000 |  |  |
Total federal income tax expense | 3,914,000 | 3,842,000 | 3,745,000 |  |  |
State income taxes [Abstract] |  |  |  |  |  |
Current | 1,016,000 | 1,373,000 | 1,216,000 |  |  |
Deferred | 1,418,000 | 663,000 | 776,000 |  |  |
Total state income tax expense | 2,434,000 | 2,036,000 | 1,992,000 |  |  |
Reconciliation of effective tax rate [Abstract] |  |  |  |  |  |
Income before federal and state income taxes | $ 23,047,000 | $ 23,876,000 | $ 22,564,000 |  |  |
Income before federal and state income taxes | 100.00% | 100.00% | 100.00% |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |
Amount computed at statutory rate | $ 4,840,000 | $ 5,014,000 | $ 4,738,000 |  |  |
Amount computed at statutory rate | 21.00% | 21.00% | 21.00% |  | 34.00% |
State income tax-net of federal tax benefit | $ 1,918,000 | $ 1,696,000 | $ 1,600,000 |  |  |
State income tax-net of federal tax benefit | 8.30% | 7.10% | 7.10% |  |  |
Regulatory liability adjustment | $ (449,000) | $ (450,000) | $ (451,000) |  |  |
Regulatory liability adjustment | (1.90%) | (1.90%) | (2.00%) |  |  |
Other | $ 39,000 | $ (382,000) | $ (150,000) |  |  |
Other | 0.20% | (1.60%) | (0.70%) |  |  |
Total income tax expense | $ 6,348,000 | $ 5,878,000 | $ 5,737,000 |  |  |
Total effective income tax rate | 27.60% | 24.60% | 25.40% |  |  |
Deferred tax assets related to [Abstract] |  |  |  |  |  |
State operating loss carry-forwards | $ 1,037,000 | $ 922,000 |  |  |  |
Valuation allowance | (906,000) | (600,000) |  |  |  |
Bad debt allowance | 92,000 | 116,000 |  |  |  |
Stock options | 47,000 | 47,000 |  |  |  |
Other | 48,000 | 28,000 |  |  |  |
Total deferred tax assets | 318,000 | 513,000 |  |  |  |
Deferred tax liabilities related to [Abstract] |  |  |  |  |  |
Property plant and equipment basis differences | (56,012,000) | (52,565,000) |  |  |  |
Bond retirement costs | (982,000) | (1,058,000) |  |  |  |
Property taxes | (624,000) | (609,000) |  |  |  |
Other | (1,081,000) | (833,000) |  |  |  |
Total deferred tax liabilities | (58,699,000) | (55,065,000) |  |  |  |
Net deferred tax liability | (58,381,000) | (54,552,000) |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |  |  |
Balance at beginning of year | 146,000 | 202,000 |  |  |  |
Additions based on tax positions related to the current year | 0 | 146,000 |  |  |  |
Additions based on tax positions related to prior years | 12,000 | 10,000 |  |  |  |
Reductions for tax positions of prior years | 0 | 0 |  |  |  |
Lapses in statutes of limitations | 0 | (212,000) |  |  |  |
Balance at end of year | 158,000 | 146,000 | $ 202,000 |  |  |
Valuation Allowance for Deferred Tax Assets [Member] |  |  |  |  |  |
Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at Beginning Of Period | 600,000 | 546,000 | 493,000 |  |  |
Additions Charged to Costs and Expenses | 312,000 | 54,000 | 53,000 |  |  |
Deductions | 6,000 | 0 | 0 |  |  |
Balance at End of Period | 906,000 | $ 600,000 | $ 546,000 |  |  |
DEPSC [Member] |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |
Net regulatory liability amount |  |  |  |  |  | $ 22,200,000
MDPSC [Member] |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |
Net regulatory liability amount | 600,000 |  |  |  |  |
State Authorities [Member] |  |  |  |  |  |
Income Tax Examination, Operating Loss Carryforwards [Abstract] |  |  |  |  |  |
Net operating loss carry-forwards | $ 15,700,000 |  |  |  |  |

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