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Note 2 - Income Per Share (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in thousands except per share data)
 
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
Numerator:
                               
Net income
  $
11,614
    $
4,632
    $
26,002
    $
6,141
 
Denominator:
                               
Denominator for basic earnings per share – weighted-average shares
   
18,343
     
18,288
     
18,337
     
18,275
 
Effect of dilutive securities:
                               
Equivalent shares issuable upon conversion of unvested restricted stock
   
154
     
116
     
111
     
91
 
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions
   
18,497
     
18,404
     
18,448
     
18,366
 
                                 
Basic income per share:   $
0.63
    $
0.25
    $
1.42
    $
0.34
 
Diluted income per share:
  $
0.63
    $
0.25
    $
1.41
    $
0.33