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INCOME TAXES (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating income (loss) | $ 4,352,000 | $ 5,945,000 | $ 4,669,000 | $ 3,853,000 | $ 3,531,000 | $ 5,394,000 | $ 4,985,000 | $ 3,672,000 | $ 18,819,000 | $ 17,582,000 | $ 16,046,000
Income tax receivable | 150,000 |  |  |  | 1,428,000 |  |  |  | 150,000 | 1,428,000 |
Federal alternative minimum tax credit carry-forwards | 2,474,000 |  |  |  | 3,971,000 |  |  |  | 2,474,000 | 3,971,000 | 5,459,000
Accrued penalties and interest | 4,800 |  |  |  | 22,000 |  |  |  | 4,800 | 22,000 |
Valuation allowance | 286,000 |  |  |  | 182,000 |  |  |  | 286,000 | 182,000 | 65,000
State income taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 1,050,000 | 499,000 | 173,000
Deferred |  |  |  |  |  |  |  |  | 860,000 | 1,299,000 | 1,231,000
Total state income tax expense |  |  |  |  |  |  |  |  | 1,910,000 | 1,798,000 | 1,404,000
Federal income taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 1,799,000 | 2,168,000 | (1,073,000)
Deferred |  |  |  |  |  |  |  |  | 4,622,000 | 3,818,000 | 6,044,000
Total federal income tax expense |  |  |  |  |  |  |  |  | 6,421,000 | 5,986,000 | 4,971,000
Reconciliation of effective tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before federal and state income taxes |  |  |  |  |  |  |  |  | $ 21,285,000 | $ 19,088,000 | $ 15,881,000
Income before federal and state income taxes |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Amount computed at statutory rate |  |  |  |  |  |  |  |  | $ 7,237,000 | $ 6,490,000 | $ 5,400,000
Amount computed at statutory rate |  |  |  |  |  |  |  |  | 34.00% | 34.00% | 34.00%
Reconciling Items [Abstract] |  |  |  |  |  |  |  |  |  |  |
State income tax-net of federal tax benefit |  |  |  |  |  |  |  |  | $ 1,327,000 | $ 1,214,000 | $ 918,000
State income tax-net of federal tax benefit |  |  |  |  |  |  |  |  | 6.20% | 6.40% | 5.80%
Other |  |  |  |  |  |  |  |  | $ (233,000) | $ 80,000 | $ 57,000
Other |  |  |  |  |  |  |  |  | (1.10%) | 0.40% | 0.40%
Total income tax expense |  |  |  |  |  |  |  |  | $ 8,331,000 | $ 7,784,000 | $ 6,375,000
Total effective income tax rate |  |  |  |  |  |  |  |  | 39.10% | 40.80% | 40.20%
Deferred tax assets related to [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal alternative minimum tax credit carry-forwards | 2,474,000 |  |  |  | 3,971,000 |  |  |  | $ 2,474,000 | $ 3,971,000 | $ 5,459,000
Federal and state operating loss carry-forwards | 752,000 |  |  |  | 675,000 |  |  |  | 752,000 | 675,000 | 1,045,000
Bad debt allowance | 104,000 |  |  |  | 110,000 |  |  |  | 104,000 | 110,000 | 99,000
Valuation allowance | (286,000) |  |  |  | (182,000) |  |  |  | (286,000) | (182,000) | (65,000)
Stock options | 452,000 |  |  |  | 415,000 |  |  |  | 452,000 | 415,000 | 397,000
Other | 320,000 |  |  |  | 291,000 |  |  |  | 320,000 | 291,000 | 269,000
Total deferred tax assets | 3,816,000 |  |  |  | 5,280,000 |  |  |  | 3,816,000 | 5,280,000 | 7,204,000
Deferred tax liabilities related to [Abstract] |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment basis differences | (70,711,000) |  |  |  | (66,508,000) |  |  |  | (70,711,000) | (66,508,000) | (63,427,000)
Uncertain tax position | (80,000) |  |  |  | (247,000) |  |  |  | (80,000) | (247,000) | (179,000)
Expenses of rate proceedings | (19,000) |  |  |  | (213,000) |  |  |  | (19,000) | (213,000) | (214,000)
Property taxes | (663,000) |  |  |  | (527,000) |  |  |  | (663,000) | (527,000) | (505,000)
Other | (796,000) |  |  |  | (756,000) |  |  |  | (796,000) | (756,000) | (734,000)
Total deferred tax liabilities | (72,269,000) |  |  |  | (68,251,000) |  |  |  | (72,269,000) | (68,251,000) | (65,059,000)
Net deferred tax liability | (68,453,000) |  |  |  | (62,971,000) |  |  |  | (68,453,000) | (62,971,000) | (57,855,000)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning Of Period |  |  |  | 182,000 |  |  |  | 65,000 | 182,000 | 65,000 | 61,000
Additions Charged to Costs and Expenses |  |  |  |  |  |  |  |  | 104,000 | 117,000 | 4,000
Deductions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance at End of Period | 286,000 |  |  |  | 182,000 |  |  |  | 286,000 | 182,000 | 65,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 247,000 |  |  |  | $ 179,000 | 247,000 | 179,000 |
Additions based on tax positions related to the current year |  |  |  |  |  |  |  |  | 23,000 | 51,000 |
Additions based on tax positions related to prior years |  |  |  |  |  |  |  |  | 11,000 | 17,000 |
Reductions for tax positions of prior years |  |  |  |  |  |  |  |  | (201,000) | 0 |
Settlements |  |  |  |  |  |  |  |  | 0 | 0 |
Lapses in Statutes of Limitations |  |  |  |  |  |  |  |  | 0 | 0 |
Balance at end of year | 80,000 |  |  |  | $ 247,000 |  |  |  | $ 80,000 | $ 247,000 | $ 179,000
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 |  |  |  |  |  |  |  |  | 2037 |  |
Federal Authorities [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Federal alternative minimum tax credit carry-forwards | 2,500,000 |  |  |  |  |  |  |  | $ 2,500,000 |  |
Tax deduction for qualifying capital expenditures |  |  |  |  |  |  |  |  | $ 2,700,000 |  |
Income tax examination description |  |  |  |  |  |  |  |  | for the tax year 2015 |  |
Deferred tax assets related to [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal alternative minimum tax credit carry-forwards | 2,500,000 |  |  |  |  |  |  |  | $ 2,500,000 |  |
State Authorities [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry-forwards | $ 13,400,000 |  |  |  |  |  |  |  | $ 13,400,000 |  |
Income tax examination description |  |  |  |  |  |  |  |  | for the tax years 2013 through 2015 |  |
State Authorities [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  | 2013 |  |
State Authorities [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  | 2015 |  |

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