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Note 5 - Debt - Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Revolver $ 210,728 $ 164,599
Total debt 211,658 166,424
Less current amount (930) (1,825)
Total long-term debt 210,728 164,599
Industrial Revenue Bond Member [Member]    
IRB 930 1,825
Asset Based Revolving Credit Facility Due June 30, 2019 [Member]    
Revolver $ 210,728 $ 164,599