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Note 21 - 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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenues $ 138,176 $ 140,325 $ 135,302 $ 119,458 $ 110,888 $ 108,899 $ 108,646 $ 109,405 $ 533,261 $ 437,838 $ 432,852
Operating expenses and costs 123,500 127,172 125,285 115,702 107,536 105,131 105,748 106,743 491,659 425,158 412,924
Operating income 14,676 13,153 10,017 3,756 3,352 3,768 2,898 2,662 41,602 12,680 19,928
Non-operating (loss) income (4,704) 935 632 (879) 384 2,767 650 2,052 (4,016) 5,853 1,485
Interest expense (2,019) (1,711) (1,355) (1,160) (1,070) (920) (935) (977) (6,245) (3,902) (3,641)
Income tax (expense) benefit (1,883) (3,129) (2,005) (330) 28,895 (2,169) (1,004) (1,454) 7,347 (24,268) 6,671
Net income $ 6,070 $ 9,248 $ 7,289 $ 1,387 $ 31,561 $ 3,446 $ 1,609 $ 2,283 $ 23,994 $ 38,899 $ 11,101
Basic (in dollars per share) $ 1.02 $ 1.53 $ 1.18 $ 0.22 $ 5.07 $ 0.54 $ 0.25 $ 0.36 $ 3.94 $ 6.14 $ 1.68
Diluted (in dollars per share) $ 1.01 $ 1.52 $ 1.17 $ 0.22 $ 5 $ 0.54 $ 0.25 $ 0.36 $ 3.90 $ 6.08 $ 1.67
Basic (in shares) 5,975 6,034 6,159 6,168 6,219 6,326 6,381 6,399 6,083 6,331 6,627
Diluted (in shares) 6,029 6,088 6,229 6,264 6,312 6,373 6,430 6,425 6,159 6,398 6,649
Total income tax (benefit) expense $ (1,883) $ (3,129) $ (2,005) $ (330) $ 28,895 $ (2,169) $ (1,004) $ (1,454) $ 7,347 $ (24,268) $ 6,671