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Note 19 - Quarterly Financial Information (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating revenues $ 102,424 $ 107,110 $ 108,033 $ 99,483 $ 101,715 $ 107,059 $ 104,343 $ 97,820 $ 417,050 $ 410,937 $ 402,813
Operating expenses and costs 97,449 96,884 96,151 90,336 98,589 98,609 95,754 94,975 380,820 387,927 391,307
Operating income 4,975 10,226 11,882 9,147 3,126 8,450 8,589 2,845 36,230 23,010 11,506
Non-operating income 1,131 (132) 272 245 974 594 259 272 1,516 2,099 1,540
Interest expense 825 732 644 617 660 632 743 862 2,818 2,897 3,375
Income tax expense 2,048 3,567 4,471 3,406 1,308 3,355 3,160 898 13,492 8,721 3,756
Net income $ 3,233 $ 5,795 $ 7,039 $ 5,369 $ 2,132 $ 5,057 $ 4,945 $ 1,357 $ 21,436 $ 13,491 $ 5,915
Basic earnings per share (in dollars per share) $ 0.45 $ 0.81 $ 0.95 $ 0.72 $ 0.27 $ 0.63 $ 0.62 $ 0.17 $ 2.94 $ 1.69 $ 0.68
Diluted earnings per share (in dollars per share) $ 0.45 $ 0.80 $ 0.94 $ 0.72 $ 0.27 $ 0.63 $ 0.62 $ 0.17 $ 2.93 $ 1.68 $ 0.68
Basic (in shares) 7,116 7,186 7,431 7,425 7,988 7,993 7,992 7,985 7,288 7,990 8,662
Diluted (in shares) 7,144 7,219 7,474 7,467 8,027 8,032 8,035 8,033 7,325 8,034 8,682