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Note 8 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2022 | Jul. 04, 2021 | Jul. 03, 2022 | Jul. 04, 2021
Total costs and expenses | $ 477 | $ 202 | $ 860 | $ 570
Cost of Sales [Member] |  |  |  |
Total costs and expenses | 117 | 18 | 173 | 54
Research and Development Expense [Member] |  |  |  |
Total costs and expenses | 91 | 82 | 176 | 239
Selling, General and Administrative Expenses [Member] |  |  |  |
Total costs and expenses | $ 269 | $ 102 | $ 511 | $ 277

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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