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Note 15 - Stock-based Compensation Plan - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Allocation of Share-based Compensation Expense | $ 1,787 | $ 1,450
Cost of Sales [Member] |  |
Allocation of Share-based Compensation Expense | 62 | 26
Selling and Marketing Expense [Member] |  |
Allocation of Share-based Compensation Expense | 32 | 22
Research and Development Expense [Member] |  |
Allocation of Share-based Compensation Expense | 51 | 62
General and Administrative Expense [Member] |  |
Allocation of Share-based Compensation Expense | $ 1,642 | $ 1,340

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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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