Note 5 - Derivative Financial Instruments (Details Textual) - USD ($)	Oct. 31, 2015	May. 02, 2015
Accrued Liabilities1 [Member]
Derivative Liability, Current	$ 6,400,000	$ 3,000,000
Other Liabilities [Member]
Derivative Liability, Noncurrent	605,000	$ 751,000
Derivative, Notional Amount	25,600,000
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	$ (6,400,000)