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Note 7 - Fair Value of Financial Instruments - Fair Value Measurements, Not Recorded (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Revolver $ 210,728 $ 164,599
Carrying Value [Member]    
Total liabilities not recorded at fair value 211,658 166,424
Revolver [Member]    
Revolver 210,728 164,599
Fair Value, Inputs, Level 1 [Member] | Carrying Value [Member]    
Total liabilities not recorded at fair value 930 1,825
Fair Value, Inputs, Level 1 [Member] | Revolver [Member]    
Revolver
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]    
Total liabilities not recorded at fair value 210,728 164,599
Fair Value, Inputs, Level 2 [Member] | Revolver [Member]    
Revolver 210,728 164,599
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]    
Total liabilities not recorded at fair value
Fair Value, Inputs, Level 3 [Member] | Revolver [Member]    
Revolver
Industrial Revenue Bonds [Member]    
Liabilities    
IRB 930 1,825
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