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Note 2 - Income Per Share (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in thousands except per share data)
 
Three Months ended
June 30,
   
Six Months ended
June 30,
 
   
2016
   
2015
   
2016
   
2015
 
Numerator:
                               
Net income
  $ 3,632     $ 11,001     $ 7,984     $ 21,228  
Denominator:
                               
Denominator for basic earnings per share – weighted-average shares
    18,189       18,261       18,168       18,204  
Effect of dilutive securities:
                               
Equivalent shares issuable upon conversion of unvested restricted stock
    86       151       76       149  
Equivalent shares issuable upon conversion of unvested employee stock options
    -       1       -       8  
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions
    18,275       18,413       18,244       18,361  
                                 
Basic income per share:
  $ 0.20     $ 0.60     $ 0.44     $ 1.17  
Diluted income per share:
  $ 0.20     $ 0.60     $ 0.44     $ 1.16