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Supplemental Financial Information (Disaggregation of Net Sales by Major Source) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Net sales | $ 26,103 | $ 33,529
Resales Of Third Party Products |  |
Net sales | 19,982 | 25,148
Sale of the Company's modular memory subsystems |  |
Net sales | $ 6,121 | $ 8,381

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