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Note 14 - Share-based Payments - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number outstanding (in shares) | shares 733,579
Weighted average exercise price per share, options outstanding (in dollars per share) $ 43.43
Weighted average remaining contractual life, options outstanding (Year) 4 years 292 days
Aggregate intrinsic value, options outstanding | $ $ 10,141
Number exercisable (in shares) | shares 326,887
Weighted average exercise price per share, options exercisable (in dollars per share) $ 29
Weighted average remaining contractual life, options exercisable (Year) 3 years 146 days
Aggregate intrinsic value, options exercisable | $ $ 8,760
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 60,573
Weighted average exercise price per share, options outstanding (in dollars per share) $ 6.89
Weighted average remaining contractual life, options outstanding (Year) 1 year 73 days
Aggregate intrinsic value, options outstanding | $ $ 2,960
Number exercisable (in shares) | shares 60,573
Weighted average exercise price per share, options exercisable (in dollars per share) $ 6.89
Weighted average remaining contractual life, options exercisable (Year) 1 year 73 days
Aggregate intrinsic value, options exercisable | $ $ 2,960
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 108,063
Weighted average exercise price per share, options outstanding (in dollars per share) $ 16.39
Weighted average remaining contractual life, options outstanding (Year) 2 years 255 days
Aggregate intrinsic value, options outstanding | $ $ 4,254
Number exercisable (in shares) | shares 95,563
Weighted average exercise price per share, options exercisable (in dollars per share) $ 15.98
Weighted average remaining contractual life, options exercisable (Year) 2 years 219 days
Aggregate intrinsic value, options exercisable | $ $ 3,801
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 72,500
Weighted average exercise price per share, options outstanding (in dollars per share) $ 23.76
Weighted average remaining contractual life, options outstanding (Year) 3 years 109 days
Aggregate intrinsic value, options outstanding | $ $ 2,319
Number exercisable (in shares) | shares 52,500
Weighted average exercise price per share, options exercisable (in dollars per share) $ 24.78
Weighted average remaining contractual life, options exercisable (Year) 3 years
Aggregate intrinsic value, options exercisable | $ $ 1,626
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 255 days
Aggregate intrinsic value, options outstanding | $ $ 286
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 146 days
Aggregate intrinsic value, options exercisable | $ $ 209
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 109 days
Aggregate intrinsic value, options outstanding | $ $ 214
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 109 days
Aggregate intrinsic value, options exercisable | $ $ 96
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 337,275
Weighted average exercise price per share, options outstanding (in dollars per share) $ 55.67
Weighted average remaining contractual life, options outstanding (Year) 5 years 219 days
Aggregate intrinsic value, options outstanding | $ $ 108
Number exercisable (in shares) | shares 99,626
Weighted average exercise price per share, options exercisable (in dollars per share) $ 55.21
Weighted average remaining contractual life, options exercisable (Year) 5 years 146 days
Aggregate intrinsic value, options exercisable | $ $ 68
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 122,293
Weighted average exercise price per share, options outstanding (in dollars per share) $ 64.10
Weighted average remaining contractual life, options outstanding (Year) 6 years 255 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 | $