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INCOME TAXES (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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   $ 546,000 $ 600,000 $ 546,000        
State income taxes [Abstract]                
Current     1,373,000 1,216,000 $ 2,348,000      
Deferred     663,000 776,000 (279,000)      
Total state income tax expense     2,036,000 1,992,000 2,069,000      
Federal income taxes [Abstract]                
Current     2,912,000 2,144,000 5,725,000      
Deferred     930,000 1,601,000 (2,110,000)      
Total federal income tax expense     3,842,000 3,745,000 3,615,000      
Reconciliation of effective tax rate [Abstract]                
Income before federal and state income taxes     $ 23,876,000 $ 22,564,000 $ 22,501,000      
Income before federal and state income taxes     100.00% 100.00% 100.00%      
Income Tax Expense (Benefit) [Abstract]                
Amount computed at statutory rate     $ 5,014,000 $ 4,738,000 $ 4,725,000      
Amount computed at statutory rate     21.00% 21.00% 21.00%   34.00%  
State income tax-net of federal tax benefit     $ 1,696,000 $ 1,600,000 $ 1,704,000      
State income tax-net of federal tax benefit     7.10% 7.10% 7.60%      
Regulatory liability adjustment     $ (450,000) $ (451,000) $ (451,000)      
Regulatory liability adjustment     (1.90%) (2.00%) (2.00%)      
Other     $ (382,000) $ (150,000) $ (294,000)      
Other     (1.60%) (0.70%) (1.30%)      
Total income tax expense     $ 5,878,000 $ 5,737,000 $ 5,684,000      
Total effective income tax rate     24.60% 25.40% 25.30%      
Deferred tax assets related to [Abstract]                
Federal and state operating loss carry-forwards   629,000 $ 922,000 $ 629,000        
Valuation allowance   (493,000) (600,000) (493,000)        
Bad debt allowance   240,000 116,000 240,000        
Stock options   148,000 47,000 148,000        
Other   75,000 28,000 75,000        
Total deferred tax assets   599,000 513,000 599,000        
Deferred tax liabilities related to [Abstract]                
Property plant and equipment basis differences   (48,536,000) (52,565,000) (48,536,000)        
Bond retirement costs   (1,210,000) (1,058,000) (1,210,000)        
Property taxes   (481,000) (609,000) (481,000)        
Other   (685,000) (833,000) (685,000)        
Total deferred tax liabilities   (50,912,000) (55,065,000) (50,912,000)        
Net deferred tax liability   (50,313,000) (54,552,000) (50,313,000)        
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]                
Balance at beginning of year     202,000 209,000        
Additions based on tax positions related to the current year     146,000 0        
Additions based on tax positions related to prior years     10,000 19,000        
Reductions for tax positions of prior years     0 0        
Lapses in statutes of limitations $ (212,000) (26,000) (212,000) (26,000)        
Balance at end of year   202,000 $ 146,000 202,000 $ 209,000      
Minimum [Member]                
Income Tax Examination, Operating Loss Carryforwards [Abstract]                
Operating loss carryforwards expiration period     2023          
Maximum [Member]                
Income Tax Examination, Operating Loss Carryforwards [Abstract]                
Operating loss carryforwards expiration period     2043          
Valuation Allowance for Deferred Tax Assets [Member]                
Valuation Allowances and Reserves [Roll Forward]                
Balance at Beginning Of Period     $ 546,000 493,000 335,000      
Additions Charged to Costs and Expenses     54,000 53,000 158,000      
Deductions     0 0 0      
Balance at End of Period   $ 546,000 600,000 $ 546,000 $ 493,000      
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     $ 13,800,000