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Note 6 - Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
   
As of December 31
,
  
(in thousands
)
  
201
7
    
201
6
  
Asset-based revolving credit facility due December 8, 202
2
   $
196,235
     $
-
  
Asset-based revolving credit facility due June 30, 201
9
    
-
      
164,599
  
Industrial revenue bond due April 1, 201
8
    
930
      
1,825
  
Total deb
t
    
197,165
      
166,424
  
Less current amoun
t
    
(930
 )    
(1,825
 )
Total long-term deb
t
   $
196,235
     $
164,599
  
Schedule of Maturities of Long-term Debt [Table Text Block]
(in thousands
)
  
201
8
    
201
9
    
202
0
    
202
1
    
202
2
    
Tota
l
  
ABL Credit Facilit
y
  
$
-
   
$
-
    $
-
     $
-
     $
196,235
     $
196,235
  
Industrial revenue bon
d
    
930
      
-
      
-
      
-
      
-
      
930
  
Total principal payment
s
   $
930
     $
-
     $
-
     $
-
     $
196,235
     $
197,165