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Note 6 - Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(In thousands, except per share amounts)
  
201
7
    
201
6
    
201
5
  
Numerator:
                        
Net income
  
$
90,284
     $
33,464
     $
35,745
  
Denominator:
                        
Basic earnings per common share - weighted-average shares
  
 
54,492
      
54,177
      
55,796
  
Effect of dilutive stock options
  
 
358
      
284
      
395
  
Diluted earnings
per common share - weighted-average shares and assumed conversions
  
 
54,850
      
54,461
      
56,191
  
Basic earnings per common share
  
$
1.66
     $
0.62
     $
0.64
  
Diluted earnings per common share
  
$
1.65
     $
0.61
     $
0.64