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Note D - Marketable Securities (Tables)
12 Months Ended
Mar. 26, 2017
Notes Tables  
Realized Gain (Loss) on Investments [Table Text Block]
   
March 27,
2016
   
March 29,
2015
 
Available-for-sale securities:
               
Proceeds
  $
10,868
    $
8,020
 
Gross realized gains
  $
26
    $
-