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Note 5 - Accounts Receivable (Tables)
 3 Months Ended
Feb. 25, 2017
Notes Tables  
Schedule Of Accounts Receivable [Table Text Block]
   
February 25,
2017
    
November 26,
2016
  
Gross accounts receivable
   $
19,214
    $
19,157
 
Allowance for doubtful accounts
    
(744
 )    
(799
 )
Accounts receivable, net
   $
18,470
    $
18,358
 
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
Balance at November 26, 2016
   $
799
 
Reductions to allowance
    
(55
 )
Balance at February 25, 2017
   $
744