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Note 13 - 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, 2018
USD ($)
$ / shares
shares
Number outstanding (in shares) | shares 702,337
Weighted average exercise price per share, options outstanding (in dollars per share) $ 43.80
Weighted average remaining contractual life, options outstanding (Year) 4 years 219 days
Aggregate intrinsic value, options outstanding | $ $ 11,895
Number exercisable (in shares) | shares 326,937
Weighted average exercise price per share, options exercisable (in dollars per share) $ 28.91
Weighted average remaining contractual life, options exercisable (Year) 3 years 73 days
Aggregate intrinsic value, options exercisable | $ $ 10,183
Exercise Price Range 01 [Member]  
Exercise price - lower (in dollars per share) $ 5.52
Exercise price - higher (in dollars per share) $ 8.56
Number outstanding (in shares) | shares 58,135
Weighted average exercise price per share, options outstanding (in dollars per share) $ 6.92
Weighted average remaining contractual life, options outstanding (Year) 328 days
Aggregate intrinsic value, options outstanding | $ $ 3,089
Number exercisable (in shares) | shares 58,135
Weighted average exercise price per share, options exercisable (in dollars per share) $ 6.92
Weighted average remaining contractual life, options exercisable (Year) 328 days
Aggregate intrinsic value, options exercisable | $ $ 3,090
Exercise Price Range 02 [Member]  
Exercise price - lower (in dollars per share) $ 10.16
Exercise price - higher (in dollars per share) $ 19.95
Number outstanding (in shares) | shares 99,588
Weighted average exercise price per share, options outstanding (in dollars per share) $ 16.44
Weighted average remaining contractual life, options outstanding (Year) 2 years 182 days
Aggregate intrinsic value, options outstanding | $ $ 4,344
Number exercisable (in shares) | shares 97,088
Weighted average exercise price per share, options exercisable (in dollars per share) $ 16.35
Weighted average remaining contractual life, options exercisable (Year) 2 years 182 days
Aggregate intrinsic value, options exercisable | $ $ 4,244
Exercise Price Range 03 [Member]  
Exercise price - lower (in dollars per share) $ 21.10
Exercise price - higher (in dollars per share) $ 27.53
Number outstanding (in shares) | shares 65,000
Weighted average exercise price per share, options outstanding (in dollars per share) $ 23.47
Weighted average remaining contractual life, options outstanding (Year) 3 years 73 days
Aggregate intrinsic value, options outstanding | $ $ 2,378
Number exercisable (in shares) | shares 55,000
Weighted average exercise price per share, options exercisable (in dollars per share) $ 23.91
Weighted average remaining contractual life, options exercisable (Year) 3 years
Aggregate intrinsic value, options exercisable | $ $ 1,988
Exercise Price Range 04 [Member]  
Exercise price - lower (in dollars per share) $ 35.25
Exercise price - higher (in dollars per share) $ 37.35
Number outstanding (in shares) | shares 14,375
Weighted average exercise price per share, options outstanding (in dollars per share) $ 35.89
Weighted average remaining contractual life, options outstanding (Year) 4 years 146 days
Aggregate intrinsic value, options outstanding | $ $ 347
Number exercisable (in shares) | shares 10,625
Weighted average exercise price per share, options exercisable (in dollars per share) $ 36.11
Weighted average remaining contractual life, options exercisable (Year) 4 years 73 days
Aggregate intrinsic value, options exercisable | $ $ 254
Exercise Price Range 05 [Member]  
Exercise price - lower (in dollars per share) $ 43.15
Exercise price - higher (in dollars per share) $ 47
Number outstanding (in shares) | shares 18,500
Weighted average exercise price per share, options outstanding (in dollars per share) $ 44.19
Weighted average remaining contractual life, options outstanding (Year) 5 years 36 days
Aggregate intrinsic value, options outstanding | $ $ 294
Number exercisable (in shares) | shares 8,000
Weighted average exercise price per share, options exercisable (in dollars per share) $ 43.75
Weighted average remaining contractual life, options exercisable (Year) 5 years 36 days
Aggregate intrinsic value, options exercisable | $ $ 131
Exercise Price Range 06 [Member]  
Exercise price - lower (in dollars per share) $ 53.20
Exercise price - higher (in dollars per share) $ 58.65
Number outstanding (in shares) | shares 328,387
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.67
Weighted average remaining contractual life, options outstanding (Year) 5 years 146 days
Aggregate intrinsic value, options outstanding | $ $ 1,443
Number exercisable (in shares) | shares 98,089
Weighted average exercise price per share, options exercisable (in dollars per share) $ 55.21
Weighted average remaining contractual life, options exercisable (Year) 5 years 36 days
Aggregate intrinsic value, options exercisable | $ $ 476
Exercise Price Range 07 [Member]  
Exercise price - lower (in dollars per share) $ 64.10
Exercise price - higher (in dollars per share) $ 64.10
Number outstanding (in shares) | shares 118,352
Weighted average exercise price per share, options outstanding (in dollars per share) $ 64.10
Weighted average remaining contractual life, options outstanding (Year) 6 years 146 days
Aggregate intrinsic value, options outstanding | $
Number exercisable (in shares) | shares
Weighted average exercise price per share, options exercisable (in dollars per share)
Weighted average remaining contractual life, options exercisable (Year)
Aggregate intrinsic value, options exercisable | $