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Note 11 - Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
Numerator:
                        
Net income
   $
105,268
     $
65,203
     $
52,720
  
                         
Denominator:
                        
Weighted-average outstanding shares used to compute basic net income per share
    
42,247
      
41,350
      
40,436
  
Effect of dilutive securities
    
2,355
      
2,228
      
1,479
  
Weighted-average outstanding shares used to compute diluted net income per share
    
44,602
      
43,578
      
41,915
  
                         
Net income per share:
                        
Basic
   $
2.49
     $
1.58
     $
1.30
  
Diluted
   $
2.36
     $
1.50
     $
1.26