Note 9 - Share-Based Compensation - Summary of Share-based Compensation Expense Recognized for Share-based Compensation Arrangements (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | $ 3,046 | $ 2,403 | $ 5,599 | $ 4,501 |
| Research and Development [Member] | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | 1,252 | 958 | 2,384 | 1,855 |
| General and Administrative [Member] | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based compensation expense | $ 1,794 | $ 1,445 | $ 3,215 | $ 2,646 |