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Note 6 - Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Numerator:
                                
Net income
   $
24,206
     $
15,014
     $
46,062
     $
29,490
  
                                 
Denominator:
                                
Weighted-average outstanding shares used to compute basic net income per share
    
42,237
      
41,323
      
42,079
      
41,185
  
Effect of dilutive securities
    
2,163
      
2,074
      
2,262
      
2,147
  
Weighted-average outstanding shares used to compute diluted net income per share
    
44,400
      
43,397
      
44,341
      
43,332
  
                                 
Net income per share:
                                
Basic
   $
0.57
     $
0.36
     $
1.09
     $
0.72
  
Diluted
   $
0.55
     $
0.35
     $
1.04
     $
0.68