Note 9 - Share-Based Compensation - Summary of Share-based Compensation Expense Recognized for Share-based Compensation Arrangements Excluding Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | $ 2,403 | $ 587 | $ 4,501 | $ 1,209 |
| Research and Development Expense [Member] | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | 958 | 259 | 1,855 | 522 |
| General and Administrative Expense [Member] | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | $ 1,445 | $ 328 | $ 2,646 | $ 687 |