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Note 7 - Stock-Based Compensation (Tables)
3 Months Ended
Aug. 26, 2012
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
August 26, 2012
   
Three Months Ended
August 28, 2011
 
Research and development
  $ 110,000     $ 124,000  
Sales, general and administrative
    238,000       317,000  
Total stock-based compensation
  $ 348,000     $ 441,000