Note 5 - Derivative Financial Instruments (Details Textual) - USD ($)	Jul. 29, 2017	Apr. 29, 2017
Derivative, Notional Amount	$ 53,200,000
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	(1,400,000)
Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Current	205,000	$ 602,000
Accrued Liabilities1 [Member]
Derivative Liability, Current	1,600,000	848,000
Other Liabilities [Member]
Derivative Liability, Noncurrent	$ 318,000	$ 476,000