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Note 7 - Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended March 31,
  
   
2019
    
2018
  
Numerator:
                
Net income
   $
26,181
     $
21,856
  
                 
Denominator:
                
Weighted-average outstanding shares used to compute basic net income per share
    
42,749
      
41,922
  
Effect of dilutive securities
    
2,483
      
2,360
  
Weighted-average outstanding shares used to compute diluted net income per share
    
45,232
      
44,282
  
                 
Net income per share:
                
Basic
   $
0.61
     $
0.52
  
Diluted
   $
0.58
     $
0.49