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Note 7 - Long-term Investment (Tables)
 9 Months Ended
Jan. 01, 2017
Notes Tables  
Investment Holdings, Schedule of Investments [Table Text Block]
 
 
January 1,
 
 
March 27,
 
 
 
2017
 
 
2016
 
Beginning balance
   $
389
    $
394
 
Donation of Counterpath shares
    
(50
 )    
-
 
Impairment charges
    
-
     
(5
 )
Ending balance
   $
339
    $
389