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INCOME TAXES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | $ 61,000 | $ 57,000 |
State income taxes [Abstract] |  |  |
Current | 526,000 | 145,000 | 106,000
Deferred | 706,000 | 1,312,000 | 994,000
Total state income tax expense | 1,232,000 | 1,457,000 | 1,100,000
Federal income taxes [Abstract] |  |  |
Current | 1,199,000 | 1,795,000 | 0
Deferred | 3,157,000 | 3,364,000 | 3,554,000
Total federal income tax expense | 4,356,000 | 5,159,000 | 3,554,000
Reconciliation of effective tax rate [Abstract] |  |  |
Income before federal and state income taxes | 13,890,000 | 16,460,000 | 11,401,000
Income before federal and state income taxes (in hundredths) | 100.00% | 100.00% | 100.00%
Amount computed at statutory rate | 4,722,000 | 5,596,000 | 3,876,000
Amount computed at statutory rate (in hundredths) | 34.00% | 34.00% | 34.00%
Reconciling Items [Abstract] |  |  |
State income tax-net of federal tax benefit | 804,000 | 952,000 | 711,000
State income tax-net of federal tax benefit (in hundredths) | 5.80% | 5.80% | 6.20%
Other | 62,000 | 68,000 | 67,000
Other (in hundredths) | 0.40% | 0.40% | 0.60%
Total income tax expense | 5,588,000 | 6,616,000 | 4,654,000
Total effective income tax rate (in hundredths) | 40.20% | 40.20% | 40.80%
Deferred tax assets related to [Abstract] |  |  |
Federal alternative minimum tax credit carry-forwards | 4,643,000 | 5,031,000 | 3,688,000
Federal and state operating loss carry-forwards | 544,000 | 481,000 | 3,077,000
Bad debt allowance | 88,000 | 96,000 | 127,000
Valuation allowance | (61,000) | (57,000) | (53,000)
Stock options | 343,000 | 294,000 | 251,000
Other | 264,000 | 326,000 | 344,000
Total deferred tax assets | 5,821,000 | 6,171,000 | 7,434,000
Deferred tax liabilities related to [Abstract] |  |  |
Property plant and equipment basis differences | (55,066,000) | (51,687,000) | (48,681,000)
Expenses of rate proceedings | (86,000) | (53,000) | (144,000)
Property taxes | (592,000) | (496,000) | (494,000)
Other | (657,000) | (651,000) | (619,000)
Total deferred tax liabilities | (56,401,000) | (52,887,000) | (49,938,000)
Net deferred tax liability | (50,580,000) | (46,716,000) | (42,504,000)
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 | (838,000) | (837,000) | (772,000)
Non-current deferred tax liability | (49,742,000) | (45,879,000) | (41,732,000)
Net deferred tax liability | (50,580,000) | (46,716,000) | (42,504,000)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning Of Period | 57,000 | 53,000 | 45,000
Additions Charged to Costs and Expenses | 4,000 | 4,000 | 8,000
Deductions | 0 | 0 | 0
Balance at End of Period | 61,000 | 57,000 | 53,000
Federal Authorities [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | 0 |  |
Income tax examination description | for tax years 2010 through 2013 |  |
State Authorities [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | $ 9,700,000 |  |
Income tax examination description | for tax years 2010 through 2013 |  |

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