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Note 17 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | [2] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues | $ 203,306 | $ 178,631 | $ 164,326 | $ 158,744 | $ 190,978 | $ 164,500 | $ 158,832 | $ 156,341 | $ 705,007 | $ 670,651 | $ 724,240
Operating income (loss) | 14,843 | 9,041 | 3,962 | 309 | 12,267 | 5,446 | 7,316 | 7,418 | 28,155 | 32,447 | 67,782
Net income | $ 49,298 | $ 4,632 | $ 1,548 | $ (39) | $ 5,982 | $ 2,869 | $ 3,632 | $ 4,352 | $ 55,439 | $ 16,835 | $ 42,085
Basic income per share (in dollars per share) | $ 2.70 | $ 0.25 | $ 0.08 | $ 0 | $ 0.33 | $ 0.16 | $ 0.20 | $ 0.21 | $ 3.03 | $ 0.93 | $ 2.32
Diluted income per share (in dollars per share) | $ 2.69 | $ 0.25 | $ 0.08 | $ 0 | $ 0.33 | $ 0.16 | $ 0.20 | $ 0.21 | $ 3.02 | $ 0.92 | $ 2.30
[1] | Includes $40.1m one-time benefit related to the Tax Cuts and Jobs Act.
[2] | Adjusted from 10-Q as filed due to implementation of ASU 2016-09.

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