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SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of quarterly unaudited consolidated statements of operations information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 16,893 | $ 18,073 | $ 17,780 | $ 16,327 | $ 16,952 | $ 19,001 | $ 17,912 | $ 16,698 | $ 69,073 | $ 70,563 | $ 65,070
Operating income | 3,277 | 4,324 | 4,145 | 2,738 | 3,479 | 4,495 | 4,294 | 3,590 | 14,484 | 15,855 | 13,736
Net income applicable to common stock | $ 1,547 | $ 2,602 | $ 2,512 | $ 1,640 | $ 1,748 | $ 2,846 | $ 2,748 | $ 2,505 | $ 8,301 | $ 9,846 | $ 6,746
Income per common share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.18 | $ 0.30 | $ 0.29 | $ 0.19 | $ 0.20 | $ 0.33 | $ 0.32 | $ 0.29 | $ 0.95 | $ 1.14 | $ 0.83
Diluted (in dollars per share) | $ 0.17 | $ 0.29 | $ 0.28 | $ 0.19 | $ 0.20 | $ 0.33 | $ 0.32 | $ 0.29 | $ 0.94 | $ 1.13 | $ 0.83

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