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Note 18 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Financial Information (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
Quarterly Financial Information [Abstract]                      
Operating revenues $ 96,545 $ 101,878 $ 104,408 $ 99,982 $ 95,773 $ 94,549 $ 94,156 $ 96,155 $ 402,813 $ 380,633 $ 359,243
Operating expenses and costs 94,477 97,194 99,402 100,234 96,167 93,610 92,884 95,069 391,307 377,730 364,586
Operating income (loss) 2,068 4,684 5,006 (252) (394) 939 1,272 1,086 11,506 2,903 (5,343)
Non-operating income 838 130 289 283 611 1,188 895 594 1,540 3,288 1,551
Interest expense 834 846 880 815 785 645 605 561 3,375 2,596 1,798
Income tax (benefit) expense 776 1,575 1,733 (328) (257) 601 627 445 3,756 1,416 (2,733)
Net (loss) income 1,296 2,393 2,682 (456) (311) 881 935 674 5,915 2,179 (2,857)
Basic (in Dollars per share) $ 0.15 $ 0.28 $ 0.31 $ (0.05) $ (0.04) $ 0.10 $ 0.11 $ 0.08 $ 0.68 $ 0.25 $ (0.32)
Diluted (in Dollars per share) $ 0.15 $ 0.28 $ 0.31 $ (0.05) $ (0.04) $ 0.10 $ 0.11 $ 0.08 $ 0.68 $ 0.25 $ (0.32)
Basic (in Shares) 8,649 8,654 8,658 8,688 8,702 8,702 8,702 8,696 8,662 8,700 9,056
Diluted (in Shares) 8,683 8,663 8,659 8,688 8,702 8,703 8,703 8,698 8,682 8,702 9,056
Income tax (benefit) expense $ 776 $ 1,575 $ 1,733 $ (328) $ (257) $ 601 $ 627 $ 445 $ 3,756 $ 1,416 $ (2,733)