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Note 11 - Benefit Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Total stock-based compensation expense | $ 2,188 | $ 2,396 | $ 6,152 | $ 7,070
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Total stock-based compensation expense | 2,194 | 2,384 | 6,147 | 7,044
Restricted Stock Awards [Member] |  |  |  |
Total stock-based compensation expense | (6) | 12 | 5 | 26
General and Administrative Expense [Member] |  |  |  |
Total stock-based compensation expense | 1,126 | 1,311 | 3,310 | 3,888
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | $ 1,062 | $ 1,085 | $ 2,842 | $ 3,182

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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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