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Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)
 12 Months Ended
Dec. 30, 2017
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Column A
  
Column B
    
Column C
    
Column D
    
Column E
  
 
 
Description
  
Balance at
Beginning
of Period
    
Charged to
Costs and
Expenses
    
 
 
Deduction
    
Balance at
End of
Period
  
                                 
Fiscal Year Ended
December 30, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
                                 
Allowance for doubtful accounts on trade receivables
   $
1,402
      
662
      
(1,097
)
   $
967
  
                                 
Provision for contingencies for legal matters
   $
455
      
192
      
(522
)
   $
125
  
                                 
Fiscal Year Ended
December 31, 2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
                                 
Allowance for doubtful accounts on trade receivables
   $
1,432
      
650
      
(680
)
   $
1,402
  
                                 
Provision for contingencies for legal matters
   $
214
      
455
      
(214
)
   $
455