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Note 14 - Stock-based Compensation Stock - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares issuable under options (in shares) 1,602,850 1,440,500
Shares issuable under options (in dollars per share) $ 30.31 $ 28.65
Granted, Number of options (in shares) 450,000 395,000
Granted, Weighted average exercise price (in dollars per share) $ 46.21 $ 32.94
Exercised, Number of options (in shares) (285,700) (144,150)
Exercised, Weighted average exercise price (in dollars per share) $ 19.74 $ 19.83
Forfeited, Number of options (in shares) (13,875) (88,500)
Forfeited, Weighted average exercise price (in dollars per share) $ 40.10 $ 32.14
Shares issuable under options (in shares) 1,753,275 1,602,850
Shares issuable under options (in dollars per share) $ 36.03 $ 30.31
Shares issuable under options (Year) 2 years 255 days  
Shares issuable under options, aggregate intrinsic value $ 42,631  
Options exercisable - End of year, Number of options (in shares) 644,450  
Options exercisable - End of year, Weighted average exercise price (in dollars per share) $ 31.77  
Options exercisable - End of year, Weighted average remaining contractual life (Year) 2 years  
Options exercisable - End of year, Aggregate intrinsic value $ 18,418