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Note 6 - Stock-Based Compensation (Details) - Summary of Stock-based Compensation by Income Statement Line Item (USD $)
3 Months Ended
Aug. 25, 2013
Aug. 26, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated stock-based compensation $ 278,000 $ 348,000
Research and Development Expense [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated stock-based compensation 14,000 110,000
Sales, General and Administrative [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated stock-based compensation $ 264,000 $ 238,000