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Note 6 - Stock-Based Compensation (Detail) - Summary of Stock-based Compensation by Income Statement Line Item (USD $)
3 Months Ended 9 Months Ended
Feb. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
Allocated stock-based compensation $ 464,000 $ 429,000 $ 1,135,000 $ 1,314,000
Research and Development Expense [Member]
       
Allocated stock-based compensation 251,000 136,000 465,000 390,000
Sales, General and Administrative [Member]
       
Allocated stock-based compensation $ 213,000 $ 293,000 $ 670,000 $ 924,000