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Note 4 - Earnings Per Common Share (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months
   
Six Months
 
   
Ended June 30,
   
Ended June 30,
 
(In thousands, except per share amounts)
 
2018
   
2017
   
2018
   
2017
 
Numerator:
                               
Net income
  $
13,702
    $
9,141
    $
24,033
    $
17,355
 
Denominator:
                               
Basic earnings per common share - weighted-average shares
   
54,613
     
54,493
     
54,592
     
54,459
 
Effect of dilutive stock options
   
513
     
309
     
523
     
313
 
Diluted earnings per common share - weighted-average shares and assumed conversions
   
55,126
     
54,802
     
55,115
     
54,772
 
                                 
Basic earnings per common share
  $
0.25
    $
0.17
    $
0.44
    $
0.32
 
Diluted earnings per common share
  $
0.25
    $
0.17
    $
0.44
    $
0.32