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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]      
Valuation allowance $ 57,000 $ 53,000  
State income taxes [Abstract]      
Current 145,000 106,000 127,000
Deferred 1,312,000 994,000 984,000
Total state income tax expense 1,457,000 1,100,000 1,111,000
Federal income taxes [Abstract]      
Current 1,795,000 0 823,000
Deferred 3,364,000 3,554,000 3,148,000
Total federal income tax expense 5,159,000 3,554,000 3,971,000
Reconciliation of effective tax rate [Abstract]      
Income before federal and state income taxes 16,460,000 11,401,000 12,702,000
Income before federal and state income taxes (in hundredths) 100.00% 100.00% 100.00%
Amount computed at statutory rate 5,596,000 3,876,000 4,319,000
Amount computed at statutory rate (in hundredths) 34.00% 34.00% 34.00%
Reconciling Items [Abstract]      
State income tax-net of federal tax benefit 952,000 711,000 726,000
State income tax-net of federal tax benefit (in hundredths) 5.80% 6.20% 5.70%
Other 68,000 67,000 37,000
Other (in hundredths) 0.40% 0.60% 0.30%
Total income tax expense 6,616,000 4,654,000 5,082,000
Total effective income tax rate (in hundredths) 40.20% 40.80% 40.00%
Deferred tax assets related to [Abstract]      
Federal alternative minimum tax credit carry-forwards 5,031,000 3,688,000 3,775,000
Federal and state operating loss carry-forwards 481,000 3,077,000 2,521,000
Bad debt allowance 96,000 127,000 132,000
Valuation allowance (57,000) (53,000) (45,000)
Stock options 294,000 251,000 0
Other 326,000 344,000 196,000
Total deferred tax assets 6,171,000 7,434,000 6,579,000
Deferred tax liabilities related to [Abstract]      
Property plant and equipment basis differences (51,687,000) (48,681,000) (43,767,000)
Expenses of rate proceedings (53,000) (144,000) (18,000)
Property taxes (496,000) (494,000) (470,000)
Other (651,000) (619,000) (341,000)
Total deferred tax liabilities (52,887,000) (49,938,000) (44,596,000)
Net deferred tax liability (46,716,000) (42,504,000) (38,017,000)
Deferred taxes, which are classified into a net current and non-current balance, are presented in the balance sheet as follows [Abstract]      
Current deferred tax liability (837,000) (772,000) (459,000)
Non-current deferred tax liability (45,879,000) (41,732,000) (37,558,000)
Net deferred tax liability (46,716,000) (42,504,000) (38,017,000)
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning Of Period 53,000 45,000 37,000
Additions Charged to Costs and Expenses 4,000 8,000 8,000
Deductions 0 0 0
Balance at End of Period 57,000 53,000 45,000
Federal Authorities [Member]
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carry-forwards 7,300,000    
State Authorities [Member]
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carry-forwards $ 8,500,000