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Note 6 - Stock-Based Compensation (Details) - Summary of Stock-based Compensation by Income Statement Line Item (USD $)
3 Months Ended 6 Months Ended
Nov. 24, 2013
Nov. 25, 2012
Nov. 24, 2013
Nov. 25, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated stock-based compensation $ 361,000 $ 323,000 $ 639,000 $ 671,000
Research and Development Expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated stock-based compensation   104,000 14,000 214,000
Sales, General and Administrative [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated stock-based compensation $ 361,000 $ 219,000 $ 625,000 $ 457,000