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Note 5 - Debt (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
   
As of
 
   
March 31,
   
December 31,
 
(in thousands)
 
2018
   
2017
 
Asset-based revolving credit facility due December 8, 2022
  $
248,955
    $
196,235
 
Industrial revenue bond due April 1, 2018
   
-
     
930
 
Total debt
   
248,955
     
197,165
 
Less current amount
   
-
     
(930
)
Total long-term debt
  $
248,955
    $
196,235