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Note 17 - Share Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding, number of options (in shares) 1,528,690 1,592,686 1,521,167  
Outstanding, weighted average exercise price (in dollars per share) $ 49.08 $ 42.04 $ 37.70  
Outstanding, weighted average remaining contractual term (Year) 5 years 6 months 6 years 3 months 18 days 6 years 10 months 24 days 7 years
Outstanding, aggregate intrinsic value $ 386,069 $ 272,553 $ 93,242 $ 19,212
Granted, number of options (in shares) 70,392 173,650 369,779  
Granted, weighted average exercise price (in dollars per share) $ 335.70 $ 102.32 $ 52.07  
Exercised, number of options (in shares) (229,921) (216,196) (263,250)  
Exercised, weighted average exercise price (in dollars per share) $ 45.95 $ 39.88 $ 30.75  
Forfeited, number of options (in shares) (27,030) (21,450) (35,010)  
Forfeited, weighted average exercise price (in dollars per share) $ 63.27 $ 50.25 $ 43.79  
Outstanding, number of options (in shares) 1,342,131 1,528,690 1,592,686 1,521,167
Outstanding, weighted average exercise price (in dollars per share) $ 64.29 $ 49.08 $ 42.04 $ 37.70
Exercisable, number of options (in shares) 896,456      
Exercisable, weighted average exercise price (in dollars per share) $ 42.04      
Exercisable, weighted average remaining contractual term (Year) 4 years 4 months 24 days      
Exercisable, aggregate intrinsic value $ 277,794