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