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INCOME TAXES (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Reserve
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Tax Disclosure [Line Items]        
Federal corporate tax rate   34.00% 34.00% 34.00%
Decrease in the net deferred income tax liability   $ 23,500,000    
Net benefit to continuing operations   1,000,000    
Net regulatory liability amount   22,500,000    
Income Tax Examination [Line Items]        
Federal alternative minimum tax credit carry-forwards   0 $ 2,474,000 $ 3,971,000
Valuation allowance   $ 360,000 286,000 182,000
Number of reserves established for uncertain tax positions | Reserve   2    
State income taxes [Abstract]        
Current   $ 489,000 1,050,000 499,000
Deferred   1,368,000 860,000 1,299,000
Total state income tax expense   1,857,000 1,910,000 1,798,000
Federal income taxes [Abstract]        
Current   (1,418,000) 1,799,000 2,168,000
Deferred   6,856,000 4,622,000 3,818,000
Total federal income tax expense   5,438,000 6,421,000 5,986,000
Reconciliation of effective tax rate [Abstract]        
Income before federal and state income taxes   $ 21,278,000 $ 21,285,000 $ 19,088,000
Income before federal and state income taxes   100.00% 100.00% 100.00%
Amount computed at statutory rate   $ 7,234,000 $ 7,237,000 $ 6,490,000
Amount computed at statutory rate   34.00% 34.00% 34.00%
Reconciling Items [Abstract]        
State income tax-net of federal tax benefit   $ 1,297,000 $ 1,327,000 $ 1,214,000
State income tax-net of federal tax benefit   6.10% 6.20% 6.40%
Federal Rate Change - FAS109   $ (957,000) $ 0 $ 0
Federal Rate Change - FAS109   (4.50%) 0.00% 0.00%
Other   $ (279,000) $ (233,000) $ 80,000
Other   (1.30%) (1.10%) 0.40%
Total income tax expense   $ 7,295,000 $ 8,331,000 $ 7,784,000
Total effective income tax rate   34.30% 39.10% 40.80%
Deferred tax assets related to [Abstract]        
Federal alternative minimum tax credit carry-forwards   $ 0 $ 2,474,000 $ 3,971,000
Federal and state operating loss carry-forwards   1,094,000 752,000 675,000
Bad debt allowance   80,000 104,000 110,000
Valuation allowance   (360,000) (286,000) (182,000)
Stock options   207,000 452,000 415,000
Other   161,000 320,000 291,000
Total deferred tax assets   1,182,000 3,816,000 5,280,000
Deferred tax liabilities related to [Abstract]        
Property plant and equipment basis differences   (52,629,000) (70,711,000) (66,508,000)
Bond retirement costs   (1,437,000) 0 0
Uncertain tax position   (145,000) (80,000) (247,000)
Expenses of rate proceedings   (8,000) (19,000) (213,000)
Property taxes   (500,000) (663,000) (527,000)
Other   (600,000) (796,000) (756,000)
Total deferred tax liabilities   (55,319,000) (72,269,000) (68,251,000)
Net deferred tax liability   (54,137,000) (68,453,000) (62,971,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]        
Balance at beginning of year $ 145,000 80,000 247,000  
Additions based on tax positions related to the current year   118,000 23,000  
Additions based on tax positions related to prior years   8,000 11,000  
Reductions for tax positions of prior years   0 (201,000)  
Settlements   0 0  
Federal tax rate change   (61,000)    
Lapses in Statutes of Limitations   0 0  
Balance at end of year   $ 145,000 80,000 247,000
Minimum [Member]        
Income Tax Examination [Line Items]        
Operating Loss Carryforwards Expiration Period   2019    
Maximum [Member]        
Income Tax Examination [Line Items]        
Operating Loss Carryforwards Expiration Period   2038    
Valuation Allowance for Deferred Tax Assets [Member]        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at Beginning Of Period $ 360,000 $ 286,000 182,000 65,000
Additions Charged to Costs and Expenses   74,000 104,000 117,000
Deductions   0 0 0
Balance at End of Period   360,000 $ 286,000 $ 182,000
Plan [Member]        
Income Tax Disclosure [Line Items]        
Federal corporate tax rate 21.00%      
Reconciliation of effective tax rate [Abstract]        
Amount computed at statutory rate 21.00%      
Federal Authorities [Member]        
Income Tax Examination [Line Items]        
Federal alternative minimum tax credit carry-forwards   1,800,000    
Tax deduction for qualifying capital expenditures   4,500,000    
Deferred tax assets related to [Abstract]        
Federal alternative minimum tax credit carry-forwards   1,800,000    
State Authorities [Member]        
Income Tax Examination [Line Items]        
Net operating loss carry-forwards   $ 15,400,000