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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenues $ 110,888 $ 108,899 $ 108,646 $ 109,405 $ 108,354 $ 109,393 $ 111,516 $ 103,589 $ 437,838 $ 432,852 $ 417,050
Operating expenses and costs 107,536 105,131 105,748 106,743 106,661 104,098 104,162 98,003 425,158 412,924 380,820
Operating income 3,352 3,768 2,898 2,662 1,693 5,295 7,354 5,586 12,680 19,928 36,230
Non-operating (loss) income 384 2,767 650 2,052 282 1,235 (10) (22) 5,853 1,485 1,516
Interest expense (1,070) (920) (935) (977) (982) (927) (910) (822) (3,902) (3,641) (2,818)
Total income tax (benefit) expense 28,895 (2,169) (1,004) (1,454) (270) (2,152) (2,442) (1,807) (24,268) 6,671 13,492
Net income $ 31,561 $ 3,446 $ 1,609 $ 2,283 $ 723 $ 3,451 $ 3,992 $ 2,935 $ 38,899 $ 11,101 $ 21,436
Basic (in dollars per share) $ 5.07 $ 0.54 $ 0.25 $ 0.36 $ 0.11 $ 0.54 $ 0.61 $ 0.41 $ 6.14 $ 1.68 $ 2.94
Diluted (in dollars per share) $ 5 $ 0.54 $ 0.25 $ 0.36 $ 0.11 $ 0.53 $ 0.61 $ 0.41 $ 6.08 $ 1.67 $ 2.93
Basic (in shares) 6,219 6,326 6,381 6,399 6,400 6,439 6,551 7,121 6,331 6,627 7,288
Diluted (in shares) 6,312 6,373 6,430 6,425 6,425 6,458 6,572 7,145 6,398 6,649 7,325