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Note 4 - Stock-based Compensation (Tables)
3 Months Ended
Aug. 27, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
 
   
August 27
, 2017
   
August 28, 2016
 
Options
  $
324
    $
291
 
RSUs
   
626
     
516
 
Total stock-based compensation
  $
950
    $
807
 
   
Three Months Ended
 
   
August 27
, 2017
   
August 28, 2016
 
Cost of sales
  $
124
    $
113
 
Research and development
   
20
     
23
 
Selling, general and administrative
   
806
     
671
 
Total stock-based compensation
  $
950
    $
807