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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) [Abstract]                      
Operating revenues $ 95,773 $ 94,549 $ 94,156 $ 96,155 $ 89,389 $ 88,938 $ 95,890 $ 85,026 $ 380,633 $ 359,243 $ 331,994
Operating expenses 96,167 93,610 92,884 95,069 89,822 91,634 94,291 88,839 377,730 364,586 332,197
OPERATING INCOME (LOSS) (394) 939 1,272 1,086 (433) (2,696) 1,599 (3,813) 2,903 (5,343) (203)
Non-operating income 611 1,188 895 594 226 173 26 1,126 3,288 1,551 852
Interest expense 785 645 605 561 442 375 491 490 2,596 1,798 2,252
Income tax expense (benefit) (257) 601 627 445 (782) (1,193) 441 (1,199) 1,416 (2,733) (948)
Net income (loss) $ (311) $ 881 $ 935 $ 674 $ 133 $ (1,705) $ 693 $ (1,978) $ 2,179 $ (2,857) $ (655)
Net income (loss) per common share [Abstract]                      
Basic (in dollars per share) $ (0.04) $ 0.10 $ 0.11 $ 0.08 $ 0.02 $ (0.19) $ 0.08 $ (0.21) $ 0.25 $ (0.32) $ (0.07)
Diluted (in dollars per share) $ (0.04) $ 0.10 $ 0.11 $ 0.08 $ 0.02 $ (0.19) $ 0.08 $ (0.21) $ 0.25 $ (0.32) $ (0.07)
Average common shares outstanding [Abstract]                      
Basic (in shares) 8,702 8,702 8,702 8,696 8,798 8,941 9,098 9,392 8,700 9,056 9,415
Diluted (in shares) 8,702 8,703 8,703 8,698 8,798 8,941 9,102 9,392 8,702 9,056 9,415