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Note 12 - Stock-based Compensation - Allocation of Share-based Compensation Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Share-Based Payment Arrangement, Expense | $ 1,160 | $ 1,740 | $ 3,661 | $ 4,754
Research and Development Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 316 | 499 | 1,011 | 1,708
Selling and Marketing Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | 126 | 3 | 255 | 185
General and Administrative Expense [Member] |  |  |  |
Share-Based Payment Arrangement, Expense | $ 718 | $ 1,238 | $ 2,395 | $ 2,861

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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 S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1 Reference 2: 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 3: 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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