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Note 11 - 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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Payment Arrangement, Expense | $ 564 | $ 605 | $ 913 | $ 1,079
Cost of Sales [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 37 | 29 | 68 | 48
Selling and Marketing Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 14 | 11 | 25 | 21
Research and Development Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 8 | 9 | 12 | 19
General and Administrative Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | $ 505 | $ 556 | $ 808 | $ 991

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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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