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Note 19 - Quarterly Results of Operations (Unaudited) - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating revenues $ 108,354 $ 109,393 $ 111,516 $ 103,589 $ 102,424 $ 107,110 $ 108,033 $ 99,483 $ 432,852 $ 417,050 $ 410,937
Operating expenses and costs 106,661 104,098 104,162 98,003 97,449 96,884 96,151 90,336 412,924 380,820 387,927
Operating income 1,693 5,295 7,354 5,586 4,975 10,226 11,882 9,147 19,928 36,230 23,010
Non-operating (loss) income 282 1,235 (10) (22) 1,131 (132) 272 245 1,485 1,516 2,099
Interest expense (982) (927) (910) (822) (825) (732) (644) (617) (3,641) (2,818) (2,897)
Total income tax expense (270) (2,152) (2,442) (1,807) (2,048) (3,567) (4,471) (3,406) 6,671 13,492 8,721
Net income $ 723 $ 3,451 $ 3,992 $ 2,935 $ 3,233 $ 5,795 $ 7,039 $ 5,369 $ 11,101 $ 21,436 $ 13,491
Basic (in dollars per share) $ 0.11 $ 0.54 $ 0.61 $ 0.41 $ 0.45 $ 0.81 $ 0.95 $ 0.72 $ 1.68 $ 2.94 $ 1.69
Diluted (in dollars per share) $ 0.11 $ 0.53 $ 0.61 $ 0.41 $ 0.45 $ 0.80 $ 0.94 $ 0.72 $ 1.67 $ 2.93 $ 1.68
Basic (in shares) 6,400 6,439 6,551 7,121 7,116 7,186 7,431 7,425 6,627 7,288 7,990
Diluted (in shares) 6,425 6,458 6,572 7,145 7,144 7,219 7,474 7,467 6,649 7,325 8,034