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Note 7 - Fair Value Measurements, Not Recorded (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member] | Industrial Revenue Bonds [Member]    
Liabilities    
IRB $ 2,690 $ 3,530
Total liabilities not recorded at fair value   $ 3,500
Fair Value, Inputs, Level 1 [Member] | Revolver Member [Member]    
Liabilities    
Revolver
Fair Value, Inputs, Level 1 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value $ 2,690 $ 3,530
Fair Value, Inputs, Level 2 [Member] | Industrial Revenue Bonds [Member]    
Liabilities    
IRB
Fair Value, Inputs, Level 2 [Member] | Revolver Member [Member]    
Liabilities    
Revolver $ 185,180 $ 244,090
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value $ 185,180 $ 244,090
Fair Value, Inputs, Level 3 [Member] | Industrial Revenue Bonds [Member]    
Liabilities    
IRB
Fair Value, Inputs, Level 3 [Member] | Revolver Member [Member]    
Liabilities    
Revolver
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value
Industrial Revenue Bonds [Member]    
Liabilities    
IRB $ 2,690 $ 3,530
Total liabilities not recorded at fair value 2,700  
Revolver Member [Member]    
Liabilities    
Revolver 185,180 244,090
Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 187,870 247,620
Revolver $ 185,180 $ 244,090