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Note 15 - Share Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Outstanding, number of options (in shares) 1,482,964 2,128,014 2,542,139  
Outstanding, weighted average exercise price (in dollars per share) $ 27.49 $ 15.15 $ 9.94  
Outstanding, weighted average remaining contractual term (Year) 7 years 109 days 7 years 182 days 7 years 255 days 8 years 182 days
Outstanding, aggregate intrinsic value $ 25,281 $ 23,840 $ 40,271 $ 96,518
Granted, number of options (in shares) 346,421 398,313 287,165  
Granted, weighted average exercise price (in dollars per share) $ 40.13 $ 33.24 $ 45.18  
Exercised, number of options (in shares) (287,375) (995,469) (604,088)  
Exercised, weighted average exercise price (in dollars per share) $ 10.58 $ 2.89 $ 3.79  
Expired, number of options (in shares)     (6,409)  
Expired, weighted average exercise price (in dollars per share)     $ 50.11  
Forfeited, number of options (in shares) (69,880) (47,894) (90,793)  
Forfeited, weighted average exercise price (in dollars per share) $ 41.12 $ 37.41 $ 37.27  
Outstanding, number of options (in shares) 1,472,130 1,482,964 2,128,014 2,542,139
Outstanding, weighted average exercise price (in dollars per share) $ 33.11 $ 27.49 $ 15.15 $ 9.94
Exercisable, number of options (in shares) 720,730      
Exercisable, weighted average exercise price (in dollars per share) $ 26.76      
Exercisable, weighted average remaining contractual term (Year) 6 years 36 days      
Exercisable, aggregate intrinsic value $ 17,239