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Note 2 - Income Per Share (Tables)
6 Months Ended
Jun. 30, 2018
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,
 
   
2018
   
2017
   
2018
   
2017
 
Numerator:
                               
Net income
  $
9,971
    $
1,548
    $
14,388
    $
1,510
 
Denominator:
                               
Denominator for basic earnings per share – weighted-average shares
   
18,337
     
18,281
     
18,334
     
18,269
 
Effect of dilutive securities:
                               
Equivalent shares issuable upon conversion of unvested restricted stock
   
104
     
78
     
90
     
78
 
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions
   
18,441
     
18,359
     
18,424
     
18,347
 
                                 
Basic and diluted income per share:
  $
0.54
    $
0.08
    $
0.78
    $
0.08