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Note 6 - Equity Incentive Plans - Schedule of Stock-based Compensation for all Stock Awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Share-based compensation expense | $ 92 | $ 192 | $ 563 | $ 429
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | 30 | 70 | 239 | 186
General and Administrative Expense [Member] |  |  |  |
Share-based compensation expense | $ 62 | $ 122 | $ 324 | $ 243

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