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Note 7 - Net Income per Share
12 Months Ended
Dec. 31, 2012
Earnings Per Share [Text Block]
7.   Net Income Per Share

Basic net income per share excludes dilution and 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.  For the years ended December 31, 2012, 2011 and, 2010, the Company had securities outstanding, which could potentially dilute basic net income per share in the future, but were excluded from the computation of diluted net income per share in the periods presented, as their effect would have been anti-dilutive. The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

   
Year Ended December 31,
 
   
2012
   
2011
   
2010
 
Numerator:
                 
Net income
  $ 15,756     $ 13,301     $ 29,563  
                         
Denominator:
                       
Weighted average outstanding shares used to compute basic net income per share
    34,871       34,050       35,830  
Effect of dilutive securities
    1,376       1,110       1,996  
Weighted average outstanding shares used to compute diluted net income per share
    36,247       35,160       37,826  
                         
Net income per share - basic
  $ 0.45     $ 0.39     $ 0.83  
Net income per share - diluted
  $ 0.43     $ 0.38     $ 0.78  

For the years ended December 31, 2012, 2011 and 2010, approximately 1.1 million, 4.9 million and 2.0 million common stock equivalents, respectively, were excluded from the calculation of diluted net income per share because their inclusion would have been anti-dilutive.