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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 29, 2019 | Sep. 30, 2020 | Sep. 29, 2019
Stock-based comepensation expense | $ 222 | $ 159 | $ 756 | $ 519
Share-based Payment Arrangement, Option [Member] |  |  |  |
Stock-based comepensation expense | 204 | 117 | 674 | 433
Restricted Stock [Member] |  |  |  |
Stock-based comepensation expense | $ 18 | $ 42 | $ 82 | $ 86

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