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Note 2 - Income Per Share (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in thousands except per share data)
 
Three Months ended March 31,
 
   
2016
   
2015
 
Numerator:
               
Net income
  $ 3,797     $ 10,227  
Denominator:
               
Denominator for basic earnings per share – weighted-average shares
    18,147       18,145  
Effect of dilutive securities:
               
Equivalent shares issuable upon conversion of unvested restricted stock
    125       147  
Equivalent shares issuable upon conversion of unvested employee stock options
    -       15  
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions
    18,272       18,307  
                 
Basic and diluted income per share:
  $ 0.21     $ 0.56