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Note 5 - Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Numerator:
                                
Net income
   $
23,642
     $
14,373
     $
53,132
     $
36,146
  
                                 
Denominator:
                                
Weighted-average outstanding shares used to compute basic net income per share
    
41,458
      
40,590
      
41,276
      
40,335
  
Effect of dilutive securities
    
2,028
      
1,305
      
2,108
      
1,417
  
Weighted-average outstanding shares used to compute diluted net income per share
    
43,486
      
41,895
      
43,384
      
41,752
  
                                 
Net income per share:
                                
Basic
  $
0.57
     $
0.35
     $
1.29
     $
0.90
  
Diluted
   $
0.54
     $
0.34
     $
1.22
     $
0.87