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Note 6 - Fair Value of Financial Instruments - Fair Value Measurements, Not Recorded (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Liabilities    
IRB $ 1,825 $ 2,690
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities    
IRB
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Liabilities    
IRB
Industrial Revenue Bonds [Member]    
Liabilities    
IRB 1,825 2,690
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 1,825 2,690
Fair Value, Inputs, Level 2 [Member] | Revolver Member [Member]    
Liabilities    
Revolver 163,516 145,800
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 163,516 145,800
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
Revolver Member [Member]    
Liabilities    
Revolver 163,516 145,800
Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 165,341 148,490
Revolver $ 163,516 $ 145,800