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Note 8 - Debt - Summary of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Asset-based revolving credit facility due December 8, 2022 $ 302,530 $ 196,235
Total debt 302,530 197,165
Less current amount (930)
Total long-term debt 302,530 196,235
Asset Based Revolving Credit Facility Due December 8, 2022 [Member]    
Asset-based revolving credit facility due December 8, 2022 302,530 196,235
Industrial Revenue Bonds [Member]    
Industrial revenue bond due April 1, 2018 $ 930