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Note 13 - Stock-based Compensation Plan - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-Based Payment Arrangement, Expense | $ 450 | $ 371 | $ 1,373 | $ 1,094
Cost of Sales [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 18 | 10 | 44 | 17
Selling and Marketing Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 9 | 8 | 23 | 17
Research and Development Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 6 | 17 | 43 | 43
General and Administrative Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | $ 417 | $ 336 | $ 1,263 | $ 1,017

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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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