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INCOME TAXES (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Reserve
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Taxes [Abstract]      
Federal corporate tax rate 21.00% 34.00% 34.00%
Decrease in the net deferred income tax liability $ 24,300 $ 23,500  
Net benefit to continuing operations 500 1,000  
Net regulatory liability amount 22,800 22,500  
Income Tax Examination, Operating Loss Carryforwards [Abstract]      
Federal alternative minimum tax credit carry-forwards 0 0 $ 2,474
Net operating loss carry-forwards 10,000    
Valuation allowance $ 396 360 286
Number of reserves established for uncertain tax positions | Reserve 2    
State income taxes [Abstract]      
Current $ 1,768 489 1,050
Deferred 71 1,368 860
Total state income tax expense 1,839 1,857 1,910
Federal income taxes [Abstract]      
Current 2,404 (1,418) 1,799
Deferred 748 6,856 4,622
Total federal income tax expense 3,152 5,438 6,421
Reconciliation of effective tax rate [Abstract]      
Income before federal and state income taxes $ 19,270 $ 21,278 $ 21,285
Income before federal and state income taxes 100.00% 100.00% 100.00%
Amount computed at statutory rate $ 4,047 $ 7,234 $ 7,237
Amount computed at statutory rate 21.00% 34.00% 34.00%
Reconciling Items [Abstract]      
State income tax-net of federal tax benefit $ 1,350 $ 1,297 $ 1,327
State income tax-net of federal tax benefit 7.00% 6.10% 6.20%
Regulatory liability adjustment $ (920) $ 0 $ 0
Regulatory liability adjustment (4.80%) 0.00% 0.00%
Federal rate change and TCJA effects $ 325 $ (957) $ 0
Federal rate change and TCJA effects 1.70% (4.50%) 0.00%
Other $ 189 $ (279) $ (233)
Other 1.00% (1.30%) (1.10%)
Total income tax expense $ 4,991 $ 7,295 $ 8,331
Total effective income tax rate 25.90% 34.30% 39.10%
Deferred tax assets related to [Abstract]      
Federal alternative minimum tax credit carry-forwards $ 0 $ 0 $ 2,474
Federal and state operating loss carry-forwards 1,050 1,094 752
Valuation allowance (396) (360) (286)
Bad debt allowance 65 80 104
Stock options 202 207 452
Other 85 161 320
Total deferred tax assets 1,006 1,182 3,816
Deferred tax liabilities related to [Abstract]      
Property plant and equipment basis differences (53,296) (52,629) (70,711)
Bond retirement costs (1,361) (1,437) 0
Uncertain tax position (283) (145) (80)
Expenses of rate proceedings (2) (8) (19)
Property taxes (521) (500) (663)
Other (597) (600) (796)
Total deferred tax liabilities (56,060) (55,319) (72,269)
Net deferred tax liability (55,054) (54,137) (68,453)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]      
Balance at beginning of year 145 80  
Additions based on tax positions related to the current year 130 118  
Additions based on tax positions related to prior years 13 8  
Reductions for tax positions of prior years 0 0 (201)
Settlements 0 0  
Federal tax rate change (5) (61)  
Lapses in statutes of limitations 0 0  
Balance at end of year $ 283 145 80
Minimum [Member]      
Income Tax Examination, Operating Loss Carryforwards [Abstract]      
Operating Loss Carryforwards Expiration Period 2019    
Maximum [Member]      
Income Tax Examination, Operating Loss Carryforwards [Abstract]      
Operating Loss Carryforwards Expiration Period 2039    
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning Of Period $ 360 286 182
Additions Charged to Costs and Expenses 36 74 104
Deductions 0 0 0
Balance at End of Period 396 360 $ 286
DEPSC [Member]      
Income Taxes [Abstract]      
Amortization of regulatory liability $ 22,200    
Amortization period of regulatory liability 49 years 6 months    
MDPSC [Member]      
Income Taxes [Abstract]      
Net regulatory liability amount $ 600    
Federal Authorities [Member]      
Income Tax Examination, Operating Loss Carryforwards [Abstract]      
Federal alternative minimum tax credit carry-forwards   2,700  
Tax deduction for qualifying capital expenditures 4,200 4,500  
Deferred tax assets related to [Abstract]      
Federal alternative minimum tax credit carry-forwards   $ 2,700  
State Authorities [Member]      
Income Tax Examination, Operating Loss Carryforwards [Abstract]      
Net operating loss carry-forwards $ 14,700