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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-Based Payment Arrangement, Expense | $ 551 | $ 454 | $ 923 | $ 723
Cost of Sales [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 15 | 7 | 26 | 7
Selling and Marketing Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 7 | 6 | 14 | 9
Research and Development Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 18 | 16 | 37 | 26
General and Administrative Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | $ 511 | $ 425 | $ 846 | $ 681

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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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