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Note 6 - Stock-Based Compensation (Tables)
9 Months Ended
Feb. 24, 2013
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
February 24, 2013
   
Three Months Ended
February 26, 2012
   
Nine Months Ended
February 24, 2013
   
Nine Months Ended
February 26, 2012
 
Research and development
  $ 251,000     $ 136,000     $ 465,000     $ 390,000  
Sales, general and administrative
  $ 213,000     $ 293,000     $ 670,000     $ 924,000  
Total stock-based compensation
  $ 464,000     $ 429,000     $ 1,135,000     $ 1,314,000