Note 11 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Stock-based compensation expense | $ 482 | $ 71 |
| Research and Development Expense [Member] | ||
| Stock-based compensation expense | 273 | 46 |
| General and Administrative Expense [Member] | ||
| Stock-based compensation expense | $ 209 | $ 25 |