Note 7 - Debt (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Prepaid Expense and Other Assets, Current	$ 5,219	$ 8,333
Amortized Banking Fees [Member]
Prepaid Expense and Other Assets, Current	$ 1,600
ABL Credit Facility [Member]
Debt Instrument, Term	5 years
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] | ABL Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 370,000
Letters of Credit, Maximum Borrowing Capacity	20,000
Maximum First In, Last Out Revolving Credit Facility	30,000
Line of Credit Facility, Additional Commitments, Maximum	200,000
Line of Credit Facility, Current Borrowing Capacity	400,000
Line Of Credit Facility Covenant Terms Monetary	$ 30,000
Line of Credit Facility Covenant Terms Percentage of Revolver Commitments	10.00%
Line of Credit Facility Covenant Terms Aggregate Borrowing Base	$ 40,000
Line of Credit Facility Covenant Terms EBITDA Ratio	1
Line of Credit Facility, Remaining Borrowing Capacity	$ 93,000
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] | ABL Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] | ABL Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] | ABL Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] | ABL Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%