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Note 15 - Stock-based Compensation - Summary of Information About Stock-based Awards Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of shares outstanding (in shares) 1,548 2,565
Weighted average remaining contractual life in years, options outstanding (Year) 4 years 73 days 4 years 36 days
Aggregate intrinsic value, options outstanding $ 34,990 $ 51,959
Number of shares exercisable (in shares) 432 557
Weighted average remaining contractual life in years, options exercisable (Year) 3 years 2 years 255 days
Aggregate intrinsic value, options exercisable $ 13,523 $ 15,827
Exercise Price 1 [Member]    
Exercise price (in dollars per share) $ 18.56
Number of shares outstanding (in shares) 23 15
Weighted average remaining contractual life in years, options outstanding (Year) 3 years 328 days 2 years 292 days
Aggregate intrinsic value, options outstanding $ 1,455 $ 526
Number of shares exercisable (in shares) 15
Weighted average remaining contractual life in years, options exercisable (Year) 2 years 292 days
Aggregate intrinsic value, options exercisable $ 526
Exercise Price 2 [Member]    
Exercise price (in dollars per share) $ 20.13 $ 19.69
Number of shares outstanding (in shares) 35 15
Weighted average remaining contractual life in years, options outstanding (Year) 1 year 109 days 2 years 219 days
Aggregate intrinsic value, options outstanding $ 1,533 $ 509
Number of shares exercisable (in shares) 35 15
Weighted average remaining contractual life in years, options exercisable (Year) 1 year 109 days 2 years 219 days
Aggregate intrinsic value, options exercisable $ 1,533 $ 509
Exercise Price 3 [Member]    
Exercise price (in dollars per share) $ 23.34 $ 20.13
Number of shares outstanding (in shares) 176 108
Weighted average remaining contractual life in years, options outstanding (Year) 1 year 146 days 2 years 109 days
Aggregate intrinsic value, options outstanding $ 7,150 $ 3,608
Number of shares exercisable (in shares) 176 108
Weighted average remaining contractual life in years, options exercisable (Year) 1 year 146 days 2 years 109 days
Aggregate intrinsic value, options exercisable $ 7,150 $ 3,608
Exercise Price 4 [Member]    
Exercise price (in dollars per share) $ 25.65 $ 20.54
Number of shares outstanding (in shares) 10 53
Weighted average remaining contractual life in years, options outstanding (Year) 109 days 2 years 109 days
Aggregate intrinsic value, options outstanding $ 398 $ 1,761
Number of shares exercisable (in shares) 10 28
Weighted average remaining contractual life in years, options exercisable (Year) 109 days 2 years 109 days
Aggregate intrinsic value, options exercisable $ 398 $ 934
Exercise Price 5 [Member]    
Exercise price (in dollars per share) $ 35.15 $ 23.34
Number of shares outstanding (in shares) 15 635
Weighted average remaining contractual life in years, options outstanding (Year) 5 years 36 days 2 years 146 days
Aggregate intrinsic value, options outstanding $ 432 $ 19,226
Number of shares exercisable (in shares) 15 140
Weighted average remaining contractual life in years, options exercisable (Year) 5 years 36 days 2 years 146 days
Aggregate intrinsic value, options exercisable $ 432 $ 4,247
Exercise Price 6 [Member]    
Exercise price (in dollars per share) $ 38.24 $ 24.57
Number of shares outstanding (in shares) 15 9
Weighted average remaining contractual life in years, options outstanding (Year) 4 years 292 days 2 years 36 days
Aggregate intrinsic value, options outstanding $ 386 $ 269
Number of shares exercisable (in shares) 15 1
Weighted average remaining contractual life in years, options exercisable (Year) 4 years 292 days 2 years 36 days
Aggregate intrinsic value, options exercisable $ 386 $ 33
Exercise Price 7 [Member]    
Exercise price (in dollars per share) $ 42.87 $ 25.65
Number of shares outstanding (in shares) 1,074 68
Weighted average remaining contractual life in years, options outstanding (Year) 4 years 182 days 1 year 109 days
Aggregate intrinsic value, options outstanding $ 22,651 $ 1,905
Number of shares exercisable (in shares) 143 68
Weighted average remaining contractual life in years, options exercisable (Year) 4 years 182 days 1 year 109 days
Aggregate intrinsic value, options exercisable $ 3,005 $ 1,905
Exercise Price 8 [Member]    
Exercise price (in dollars per share) $ 47.46 $ 26.70
Number of shares outstanding (in shares) 38 15
Weighted average remaining contractual life in years, options outstanding (Year) 5 years 328 days 3 years 292 days
Aggregate intrinsic value, options outstanding $ 619 $ 404
Number of shares exercisable (in shares) 38 15
Weighted average remaining contractual life in years, options exercisable (Year) 5 years 328 days 3 years 292 days
Aggregate intrinsic value, options exercisable $ 619 $ 404
Exercise Price 9 [Member]    
Exercise price (in dollars per share) $ 57.97 $ 28.23
Number of shares outstanding (in shares) 30 30
Weighted average remaining contractual life in years, options outstanding (Year) 6 years 219 days 4 years 292 days
Aggregate intrinsic value, options outstanding $ 180 $ 762
Number of shares exercisable (in shares) 30
Weighted average remaining contractual life in years, options exercisable (Year) 4 years 292 days
Aggregate intrinsic value, options exercisable $ 762
Exercise Price 10 [Member]    
Exercise price (in dollars per share) $ 58.79 $ 29.52
Number of shares outstanding (in shares) 23 400
Weighted average remaining contractual life in years, options outstanding (Year) 4 years 182 days 3 years 219 days
Aggregate intrinsic value, options outstanding $ 120 $ 9,640
Number of shares exercisable (in shares) 75
Weighted average remaining contractual life in years, options exercisable (Year) 3 years 219 days
Aggregate intrinsic value, options exercisable $ 1,807
Exercise Price 11 [Member]    
Exercise price (in dollars per share) $ 63.35 $ 29.95
Number of shares outstanding (in shares) 109 17
Weighted average remaining contractual life in years, options outstanding (Year) 5 years 328 days 109 days
Aggregate intrinsic value, options outstanding $ 66 $ 400
Number of shares exercisable (in shares) 17
Weighted average remaining contractual life in years, options exercisable (Year) 109 days
Aggregate intrinsic value, options exercisable $ 400
Exercise Price 12 [Member]    
Exercise price (in dollars per share)   $ 35.15
Number of shares outstanding (in shares)   15
Weighted average remaining contractual life in years, options outstanding (Year)   6 years 36 days
Aggregate intrinsic value, options outstanding   $ 277
Number of shares exercisable (in shares)  
Weighted average remaining contractual life in years, options exercisable (Year)  
Aggregate intrinsic value, options exercisable  
Exercise Price 13 [Member]    
Exercise price (in dollars per share)   $ 38.24
Number of shares outstanding (in shares)   45
Weighted average remaining contractual life in years, options outstanding (Year)   5 years 292 days
Aggregate intrinsic value, options outstanding   $ 692
Number of shares exercisable (in shares)   45
Weighted average remaining contractual life in years, options exercisable (Year)   5 years 292 days
Aggregate intrinsic value, options exercisable   $ 692
Exercise Price 14 [Member]    
Exercise price (in dollars per share)   $ 42.87
Number of shares outstanding (in shares)   1,080
Weighted average remaining contractual life in years, options outstanding (Year)   5 years 182 days
Aggregate intrinsic value, options outstanding   $ 11,610
Number of shares exercisable (in shares)  
Weighted average remaining contractual life in years, options exercisable (Year)  
Aggregate intrinsic value, options exercisable  
Exercise Price 15 [Member]    
Exercise price (in dollars per share)   $ 47.46
Number of shares outstanding (in shares)   60
Weighted average remaining contractual life in years, options outstanding (Year)   6 years 328 days
Aggregate intrinsic value, options outstanding   $ 370
Number of shares exercisable (in shares)  
Weighted average remaining contractual life in years, options exercisable (Year)  
Aggregate intrinsic value, options exercisable