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Note 8 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2023 | Oct. 02, 2022 | Oct. 01, 2023 | Oct. 02, 2022
Total costs and expenses | $ 616 | $ 487 | $ 1,917 | $ 1,347
Cost of Sales [Member] |  |  |  |
Total costs and expenses | 73 | 44 | 239 | 217
Research and Development Expense [Member] |  |  |  |
Total costs and expenses | 171 | 149 | 513 | 325
Selling, General and Administrative Expenses [Member] |  |  |  |
Total costs and expenses | $ 372 | $ 294 | $ 1,165 | $ 805

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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