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Note 14 - Stock Option Plans - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Number outstanding (in shares) | shares 845,020
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.31
Weighted average remaining contractual life, options outstanding (Year) 4 years 4 months 24 days
Aggregate intrinsic value, options outstanding | $ $ 15,699
Number exercisable (in shares) | shares 401,345
Weighted average exercise price per share, options exercisable (in dollars per share) $ 49.21
Weighted average remaining contractual life, options exercisable (Year) 3 years 2 months 12 days
Aggregate intrinsic value, options exercisable | $ $ 9,906
Exercise Price Range 01 [Member]  
Exercise price - lower (in dollars per share) $ 15.93
Exercise price - higher (in dollars per share) $ 19.95
Number outstanding (in shares) | shares 48,564
Weighted average exercise price per share, options outstanding (in dollars per share) $ 17.77
Weighted average remaining contractual life, options outstanding (Year) 1 year
Aggregate intrinsic value, options outstanding | $ $ 2,726
Number exercisable (in shares) | shares 48,564
Weighted average exercise price per share, options exercisable (in dollars per share) $ 17.77
Weighted average remaining contractual life, options exercisable (Year) 1 year
Aggregate intrinsic value, options exercisable | $ $ 2,726
Exercise Price Range 02 [Member]  
Exercise price - lower (in dollars per share) $ 21.10
Exercise price - higher (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 6 months
Aggregate intrinsic value, options outstanding | $ $ 1,817
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 6 months
Aggregate intrinsic value, options exercisable | $ $ 1,817
Exercise Price Range 03 [Member]  
Exercise price - lower (in dollars per share) $ 35.25
Exercise price - higher (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 6 months
Aggregate intrinsic value, options outstanding | $ $ 208
Number exercisable (in shares) | shares 4,375
Weighted average exercise price per share, options exercisable (in dollars per share) $ 37.35
Weighted average remaining contractual life, options exercisable (Year) 1 year
Aggregate intrinsic value, options exercisable | $ $ 160
Exercise Price Range 04 [Member]  
Exercise price - lower (in dollars per share) $ 46.90
Exercise price - higher (in dollars per share) $ 48.00
Number outstanding (in shares) | shares 14,000
Weighted average exercise price per share, options outstanding (in dollars per share) $ 47.33
Weighted average remaining contractual life, options outstanding (Year) 5 years 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 372
Number exercisable (in shares) | shares 4,750
Weighted average exercise price per share, options exercisable (in dollars per share) $ 47.21
Weighted average remaining contractual life, options exercisable (Year) 3 years 9 months 18 days
Aggregate intrinsic value, options exercisable | $ $ 126
Exercise Price Range 05 [Member]  
Exercise price - lower (in dollars per share) $ 51.82
Exercise price - higher (in dollars per share) $ 59.98
Number outstanding (in shares) | shares 309,659
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.51
Weighted average remaining contractual life, options outstanding (Year) 3 years 6 months
Aggregate intrinsic value, options outstanding | $ $ 5,690
Number exercisable (in shares) | shares 233,378
Weighted average exercise price per share, options exercisable (in dollars per share) $ 55.49
Weighted average remaining contractual life, options exercisable (Year) 3 years 4 months 24 days
Aggregate intrinsic value, options exercisable | $ $ 4,295
Exercise Price Range 06 [Member]  
Exercise price - lower (in dollars per share) $ 60.01
Exercise price - higher (in dollars per share) $ 68.41
Number outstanding (in shares) | shares 410,922
Weighted average exercise price per share, options outstanding (in dollars per share) $ 62.07
Weighted average remaining contractual life, options outstanding (Year) 5 years 7 months 6 days
Aggregate intrinsic value, options outstanding | $ $ 4,858
Number exercisable (in shares) | shares 74,028
Weighted average exercise price per share, options exercisable (in dollars per share) $ 63.33
Weighted average remaining contractual life, options exercisable (Year) 4 years 9 months 18 days
Aggregate intrinsic value, options exercisable | $ $ 782
Exercise Price Range 07 [Member]  
Exercise price - lower (in dollars per share) $ 72.50
Exercise price - higher (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 10 months 24 days
Aggregate intrinsic value, options outstanding | $ $ 28
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