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Note 21 - Stock-based Compensation - Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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
Granted, Number of options (in shares) 547,250 960,000
Granted, Weighted average exercise price (in dollars per share) $ 85.79 $ 70.99
Exercised, Number of options (in shares) (344,225) (632,075)
Exercised, Weighted average exercise price (in dollars per share) $ 35.86 $ 34.71
Forfeited, Number of options (in shares) (14,500) (223,750)
Forfeited, Weighted average exercise price (in dollars per share) $ 70.07 $ 61.41
Shares issuable under options (in shares) 2,190,125 2,001,600
Shares issuable under options, Weighted average exercise price (in dollars per share) $ 69.22 $ 58.96
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 $ 43,606  
Options exercisable - End of year, Number of options (in shares) 747,975  
Options exercisable - End of year, Weighted average exercise price (in dollars per share) $ 60.51  
Options exercisable - End of year, Weighted average remaining contractual life (Year) 2 years 109 days  
Options exercisable - End of year, Aggregate intrinsic value $ 21,407,000