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Note 14 - Segment Information - Total Assets by Geographic Area (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 28, 2019 | Sep. 28, 2019
--- | --- | --- | ---
Total assets | $ 62,553 | $ 96,173 | $ 91,740
UNITED STATES |  |  |
Total assets | 39,760 | 75,724 |
CANADA |  |  |
Total assets | 14,828 | 13,770 |
PUERTO RICO |  |  |
Total assets | 2,105 | 2,066 |
SERBIA |  |  |
Total assets | $ 5,840 | $ 4,613 |

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