Note 7 - Stockholders' Equity- Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Stock-based compensation | $ 163 | $ 331 | $ 523 | $ 714 |
| Research and Development Expense [Member] | ||||
| Stock-based compensation | 31 | 89 | 102 | 179 |
| General and Administrative Expense [Member] | ||||
| Stock-based compensation | $ 132 | $ 242 | $ 421 | $ 535 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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