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Note 5 - Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Numerator:
                                
Net income
   $
15,014
     $
11,198
     $
29,490
     $
21,773
  
                                 
Denominator:
                                
Weighted-average outstanding shares used to compute basic net income per share
    
41,323
      
40,387
      
41,185
      
40,208
  
Effect of dilutive securities
    
2,074
      
1,329
      
2,147
      
1,473
  
Weighted-average outstanding shares used to compute diluted net income per share
    
43,397
      
41,716
      
43,332
      
41,681
  
                                 
Net income per share:
                                
Basic
   $
0.36
     $
0.28
     $
0.72
     $
0.54
  
Diluted
   $
0.35
     $
0.27
     $
0.68
     $
0.52