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Note 5 - Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2017
 
 
2016
 
Numerator:
                
Net income
   $
14,477
    $
10,575
 
                 
Denominator:
                
Weighted-average outstanding shares used to compute basic net income per share
    
41,047
     
40,028
 
Effect of dilutive securities
    
2,221
     
1,618
 
Weighted-average outstanding shares used to compute diluted net income per share
    
43,268
     
41,646
 
                 
Net income per share:
                
Basic
  $
0.35
    $
0.26
 
Diluted
   $
0.33
    $
0.25