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Note 17 - Stock-based Compensation - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shares issuable under options (in shares) 1,897,425 1,753,275
Shares issuable under options, Weighted average exercise price (in dollars per share) $ 45.08 $ 36.03
Granted, Number of options (in shares) 960,000 470,000
Granted, Weighted average exercise price (in dollars per share) $ 70.99 $ 67.32
Exercised, Number of options (in shares) (632,075) (278,975)
Exercised, Weighted average exercise price (in dollars per share) $ 34.71 $ 26.60
Forfeited, Number of options (in shares) (223,750) (46,875)
Forfeited, Weighted average exercise price (in dollars per share) $ 61.41 $ 39.66
Shares issuable under options (in shares) 2,001,600 1,897,425
Shares issuable under options, Weighted average exercise price (in dollars per share) $ 58.96 $ 45.08
Shares issuable under options - End of year, Weighted average remaining contractual life (Year) 3 years 73 days  
Shares issuable under options - End of year, Aggregate intrinsic value $ 38,054  
Options exercisable - End of year, Number of options (in shares) 645,975  
Options exercisable - End of year, Weighted average exercise price (in dollars per share) $ 47.48  
Options exercisable - End of year, Weighted average remaining contractual life (Year) 2 years  
Options exercisable - End of year, Aggregate intrinsic value $ 19,695