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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Outstanding, number of options (in shares) 1,268,404 1,342,131 1,528,690  
Outstanding, weighted average exercise price (in dollars per share) $ 81.35 $ 64.29 $ 49.08  
Outstanding, weighted average remaining contractual term (Year) 5 years 4 years 10 months 24 days 5 years 6 months 6 years 3 months 18 days
Outstanding, aggregate intrinsic value $ 75,587 $ 47,764 $ 386,069 $ 272,553
Granted, number of options (in shares) 208,392 109,266 70,392  
Granted, weighted average exercise price (in dollars per share) $ 119.31 $ 282.2 $ 335.7  
Exercised, number of options (in shares) (159,316) (137,305) (229,921)  
Exercised, weighted average exercise price (in dollars per share) $ 42.46 $ 36.91 $ 45.95  
Forfeited, number of options (in shares) (33,144) (45,688) (27,030)  
Forfeited, weighted average exercise price (in dollars per share) $ 185.81 $ 194.05 $ 63.27  
Outstanding, number of options (in shares) 1,284,336 1,268,404 1,342,131 1,528,690
Outstanding, weighted average exercise price (in dollars per share) $ 89.64 $ 81.35 $ 64.29 $ 49.08
Exercisable, number of options (in shares) 961,340      
Exercisable, weighted average exercise price (in dollars per share) $ 63.08