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Note 6 - Stock-Based Compensation (Detail) - The following table summarizes the stock-based compensation by income statement line item: (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
Allocated stock-based compensation $ 348,000 $ 441,000
Research and Development Expense [Member]
   
Allocated stock-based compensation 110,000 124,000
Sales, General and Administrative [Member]
   
Allocated stock-based compensation $ 238,000 $ 317,000