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Note 7 - Debt - Summary of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Revolver $ 304,484 $ 196,235
Total debt 304,484 197,165
Less current amount (930)
Total long-term debt 304,484 196,235
Asset Based Revolving Credit Facility Due December 8, 2022 [Member]    
Revolver 304,484 196,235
Industrial Revenue Bonds [Member]    
IRB $ 930