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Product Warranty Reserves (Tables)
12 Months Ended
Dec. 26, 2020
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] The following is a summary of the Company's product warranty activity:
 20202019
Product warranty reserve at beginning of period$1,002 $1,069 
Warranty liabilities accrued782 1,667 
Warranty liabilities settled(790)(1,695)
Changes for pre-existing warranty liabilities (39)
Product warranty reserve at end of period$994 $1,002