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Note 15 - Share-based Payments - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number outstanding (in shares) | shares 808,619
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.55
Weighted average remaining contractual life, options outstanding (Year) 4 years 1 month 6 days
Aggregate intrinsic value, options outstanding | $ $ 17,751
Number exercisable (in shares) | shares 378,258
Weighted average exercise price per share, options exercisable (in dollars per share) $ 49.35
Weighted average remaining contractual life, options exercisable (Year) 2 years 10 months 24 days
Aggregate intrinsic value, options exercisable | $ $ 10,648
Exercise Price Range 01 [Member]  
Exercise price - lower limit (in dollars per share) $ 15.93
Exercise price - upper limit (in dollars per share) $ 19.95
Number outstanding (in shares) | shares 42,064
Weighted average exercise price per share, options outstanding (in dollars per share) $ 18.05
Weighted average remaining contractual life, options outstanding (Year) 9 months 18 days
Aggregate intrinsic value, options outstanding | $ $ 2,501
Number exercisable (in shares) | shares 42,064
Weighted average exercise price per share, options exercisable (in dollars per share) $ 18.05
Weighted average remaining contractual life, options exercisable (Year) 9 months 18 days
Aggregate intrinsic value, options exercisable | $ $ 2,501
Exercise Price Range 02 [Member]  
Exercise price - lower limit (in dollars per share) $ 21.10
Exercise price - upper limit (in dollars per share) $ 27.53
Number outstanding (in shares) | shares 36,250
Weighted average exercise price per share, options outstanding (in dollars per share) $ 23.76
Weighted average remaining contractual life, options outstanding (Year) 1 year 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 1,948
Number exercisable (in shares) | shares 36,250
Weighted average exercise price per share, options exercisable (in dollars per share) $ 23.76
Weighted average remaining contractual life, options exercisable (Year) 1 year 2 months 12 days
Aggregate intrinsic value, options exercisable | $ $ 1,948
Exercise Price Range 03 [Member]  
Exercise price - lower limit (in dollars per share) $ 32.25
Exercise price - upper limit (in dollars per share) $ 37.35
Number outstanding (in shares) | shares 5,625
Weighted average exercise price per share, options outstanding (in dollars per share) $ 36.88
Weighted average remaining contractual life, options outstanding (Year) 1 year 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 228
Number exercisable (in shares) | shares 5,625
Weighted average exercise price per share, options exercisable (in dollars per share) $ 36.88
Weighted average remaining contractual life, options exercisable (Year) 1 year 2 months 12 days
Aggregate intrinsic value, options exercisable | $ $ 228
Exercise Price Range 04 [Member]  
Exercise price - lower limit (in dollars per share) $ 46.90
Exercise price - upper limit (in dollars per share) $ 48.00
Number outstanding (in shares) | shares 13,000
Weighted average exercise price per share, options outstanding (in dollars per share) $ 47.36
Weighted average remaining contractual life, options outstanding (Year) 4 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ $ 392
Number exercisable (in shares) | shares 6,000
Weighted average exercise price per share, options exercisable (in dollars per share) $ 47.17
Weighted average remaining contractual life, options exercisable (Year) 3 years 6 months
Aggregate intrinsic value, options exercisable | $ $ 182
Exercise Price Range 05 [Member]  
Exercise price - lower limit (in dollars per share) $ 51.82
Exercise price - upper limit (in dollars per share) $ 59.98
Number outstanding (in shares) | shares 291,372
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.52
Weighted average remaining contractual life, options outstanding (Year) 3 years 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 6,405
Number exercisable (in shares) | shares 217,616
Weighted average exercise price per share, options exercisable (in dollars per share) $ 55.50
Weighted average remaining contractual life, options exercisable (Year) 3 years 1 month 6 days
Aggregate intrinsic value, options exercisable | $ $ 4,787
Exercise Price Range 06 [Member]  
Exercise price - lower limit (in dollars per share) $ 60.01
Exercise price - upper limit (in dollars per share) $ 68.41
Number outstanding (in shares) | shares 400,308
Weighted average exercise price per share, options outstanding (in dollars per share) $ 62.07
Weighted average remaining contractual life, options outstanding (Year) 5 years 3 months 18 days
Aggregate intrinsic value, options outstanding | $ $ 6,177
Number exercisable (in shares) | shares 70,703
Weighted average exercise price per share, options exercisable (in dollars per share) $ 63.32
Weighted average remaining contractual life, options exercisable (Year) 4 years 7 months 6 days
Aggregate intrinsic value, options exercisable | $ $ 1,002
Exercise Price Range 07 [Member]  
Exercise price - lower limit (in dollars per share) $ 72.50
Exercise price - upper limit (in dollars per share) $ 72.50
Number outstanding (in shares) | shares 20,000
Weighted average exercise price per share, options outstanding (in dollars per share) $ 72.50
Weighted average remaining contractual life, options outstanding (Year) 6 years 8 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 100
Number exercisable (in shares) | shares 0
Weighted average exercise price per share, options exercisable (in dollars per share) $ 0
Aggregate intrinsic value, options exercisable | $ $ 0