Note 3 - Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 27, 2013
Note 3 - Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100
Debt Instrument, Basis Spread on Variable Rate	0.90%
Line of Credit Facility, Amount Outstanding	45
Letters of Credit Outstanding, Amount	2.3
Line of Credit Facility, Remaining Borrowing Capacity	$ 52.7
LIBOR Rate [Member]
Note 3 - Debt (Details) [Line Items]
Debt Instrument, Interest Rate at Period End	1.10%