Note 3 - Debt (Details Textual) $ in Thousands			6 Months Ended
	May 01, 2018 USD ($)	May 04, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Amortization of Debt Issuance Costs			$ 1,856	$ 306
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000
Line of Credit Facility, Monthly Minimum Fixed Charge Ratio	1
Line of Credit Facility, Percent, Loan Cap Threshold for Default	12.50%
Line of Credit Facility Monthly Minimum Fixed Charge Coverage Ratio Liquidity Threshold For Testing	$ 30,000
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Less Than 25% of Total Commitment [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Line of Credit Facility, Used Capacity of Total Commitment	25.00%
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 25% of Total Commitment [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
Line of Credit Facility, Used Capacity of Total Commitment	25.00%
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
New Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 200,000
Line of Credit Facility, Monthly Minimum Fixed Charge Ratio		1
Debt Instrument, Basis Spread On Variable Rate, Alternative Rate		1.00%
Line of Credit Facility, Monthly Minimum Fixed Charge Coverage Ratio, Liquidity Threshold for Testing, 2018 and Thereafter		$ 40,000
Amortization of Debt Issuance Costs	$ 1,500
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Less Than 25% of Total Commitment [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.75%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 25% and Less Than 50% of Total Commitment [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 50% of Total Commitment [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.375%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Minimum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 25% and Less Than 50% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		25.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Minimum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 50% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		50.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Maximum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Less Than 25% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		25.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | Maximum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 25% and Less Than 50% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		50.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Less Than 37.5% of Total Commitment [Member]
Debt Instrument, Basis Spread on Variable Rate, Step-up		0.25%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 62.5% of Total Commitment [Member]
Debt Instrument, Basis Spread on Variable Rate, Step-down		0.25%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Equal To or Greater Than 62.5% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		62.50%
Amended Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Condition of a Credit Facility if the Used Capacity of Facility is Less Than 37.5% of Total Commitment [Member]
Line of Credit Facility, Used Capacity of Total Commitment		37.50%