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Note 5 - Accounts Receivable (Tables)
9 Months Ended
Aug. 25, 2018
Notes Tables  
Schedule Of Accounts Receivable [Table Text Block]
   
August 25,
2018
   
November 25,
2017
 
Gross accounts receivable
  $
20,466
    $
20,257
 
Allowance for doubtful accounts
   
(981
)    
(617
)
Accounts receivable, net
  $
19,485
    $
19,640
 
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
   
2018
 
         
Balance at November 25, 2017
  $
617
 
Acquired allowance on accounts receivable (Note 3)
   
50
 
Additions charged to expense
   
329
 
Write-offs and other reductions
   
(15
)
Balance at August 25, 2018
  $
981