Note 10 - Fair Value of Assets and Liabilities - Fair Value Measurements, Not Recorded (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liabilities
Asset-based revolving credit facility due December 8, 2022	$ 302,530	$ 196,235
Total liabilities not recorded at fair value	302,530
Carrying Value [Member]
Liabilities
Total liabilities not recorded at fair value	302,530	197,165
ABL Credit Facility [Member]
Liabilities
Asset-based revolving credit facility due December 8, 2022	302,530	196,235
Total liabilities not recorded at fair value	302,530
Industrial Revenue Bonds [Member]
Liabilities
Industrial revenue bond due April 1, 2018		930
Fair Value, Inputs, Level 1 [Member] | Carrying Value [Member]
Liabilities
Total liabilities not recorded at fair value		930
Fair Value, Inputs, Level 1 [Member] | ABL Credit Facility [Member]
Liabilities
Asset-based revolving credit facility due December 8, 2022
Fair Value, Inputs, Level 1 [Member] | Industrial Revenue Bonds [Member]
Liabilities
Industrial revenue bond due April 1, 2018		930
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]
Liabilities
Total liabilities not recorded at fair value	302,530	196,235
Fair Value, Inputs, Level 2 [Member] | ABL Credit Facility [Member]
Liabilities
Asset-based revolving credit facility due December 8, 2022	302,530	196,235
Fair Value, Inputs, Level 2 [Member] | Industrial Revenue Bonds [Member]
Liabilities
Industrial revenue bond due April 1, 2018
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]
Liabilities
Total liabilities not recorded at fair value
Fair Value, Inputs, Level 3 [Member] | ABL Credit Facility [Member]
Liabilities
Asset-based revolving credit facility due December 8, 2022
Fair Value, Inputs, Level 3 [Member] | Industrial Revenue Bonds [Member]
Liabilities
Industrial revenue bond due April 1, 2018