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Receivables, Net (Tables)
 6 Months Ended
Jun. 27, 2020
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables are summarized as follows:
 
June 27,
2020
 
December 28,
2019
Customers, trade
$
30,277

 
$
34,285

Other receivables
1,940

 
3,115

Gross receivables
32,217

 
37,400

Less: allowance for doubtful accounts
(210
)
 
(262
)
Receivables, net
$
32,007

 
$
37,138