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Note 5 - Net Income Per Share
 9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Earnings Per Share [Text Block]
5
. NET INCOME PER SHARE
 
Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock, and calculated using the treasury stock method.
 Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding common shares and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period. 
 
The Company
’s outstanding RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do
not
fulfill their service requirement and the awards do
not
vest. Accordingly, these awards are
not
treated as participating securities in the net income per share calculation. 
 
The following table sets forth the computation of basic and diluted net income per share (in thousands, except per-share amounts):
 
   
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