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Note 5 - Accounts Receivable (Tables)
 12 Months Ended
Nov. 25, 2017
Notes Tables  
Schedule Of Accounts Receivable [Table Text Block]
   
November 25,
2017
    
November 26,
2016
  
Gross accounts receivable
   $
20,257
     $
19,157
  
Allowance for doubtful accounts
    
(617
 )    
(799
 )
Net accounts receivable
   $
19,640
     $
18,358
  
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
   
2017
    
2016
  
                 
Balance, beginning of the year
   $
799
     $
1,175
  
Reductions to allowance, net
    
(182
 )    
(376
 )
Balance, end of the year
   $
617
     $
799