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Note 5 - Accounts Receivable (Tables)
 9 Months Ended
Aug. 26, 2017
Notes Tables  
Schedule Of Accounts Receivable [Table Text Block]
   
August 26,
2017
    
November 26,
2016
  
Gross accounts receivable
   $
20,130
     $
19,157
  
Allowance for doubtful accounts
    
(616
 )    
(799
 )
Accounts receivable, net
   $
19,514
     $
18,358
  
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
Balance at November 26, 2016
   $
799
  
Reductions to allowance
    
(183
 )
Balance at August 26, 2017
   $
616