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Note 4 - Debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 27, 2013
Note 4 - 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 50
Letters of Credit Outstanding, Amount 2.3
Line of Credit Facility, Remaining Borrowing Capacity $ 47.7
LIBOR Rate [Member]
  
Note 4 - Debt (Details) [Line Items]  
Debt Instrument, Interest Rate at Period End 1.10%