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Note 5 - Debt (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
   
As of
 
   
September 30,
   
December 31,
 
(in thousands)
 
2017
   
2016
 
Asset-based revolving credit facility due June 30, 2019
  $
220,409
    $
164,599
 
Industrial revenue bond due April 1, 2018
   
930
     
1,825
 
Total debt
   
221,339
     
166,424
 
Less current amount
   
(930
)    
(1,825
)
Total long-term debt
  $
220,409
    $
164,599