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Note 8 - Fair Value of Financial Instruments - Fair Value Measurements, Not Recorded (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Liabilities    
ABL Credit Facility $ 196,235 $ 164,599
Total liabilities not recorded at fair value 197,165  
Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 197,165 166,424
Fair Value, Inputs, Level 1 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 930 1,825
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value 196,235 164,599
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]    
Liabilities    
Total liabilities not recorded at fair value
Industrial Revenue Bonds [Member]    
Liabilities    
IRB 930 1,825
Total liabilities not recorded at fair value 930  
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Liabilities    
IRB 930 1,825
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities    
IRB
Industrial Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Liabilities    
IRB
ABL Credit Facility [Member]    
Liabilities    
ABL Credit Facility 196,235 164,599
Total liabilities not recorded at fair value 196,235  
ABL Credit Facility [Member] | Fair Value, Inputs, Level 1 [Member]    
Liabilities    
ABL Credit Facility
ABL Credit Facility [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities    
ABL Credit Facility 196,235 164,599
ABL Credit Facility [Member] | Fair Value, Inputs, Level 3 [Member]    
Liabilities    
ABL Credit Facility