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Supplemental Financial Information (Net Sales by Country) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Net sales $ 26,103 $ 33,529
UNITED STATES    
Net sales 19,919 23,533
CHINA    
Net sales 2,167 4,151
Other Countries    
Net sales $ 4,017 $ 5,845