Note 9 - Share-Based Compensation - Summary of Share-based Compensation Expense Recognized for Share-based Compensation Arrangements (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation expense | $ 2,553 | $ 2,098 |
| Research and Development [Member] | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation expense | 1,132 | 897 |
| General and Administrative [Member] | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation expense | $ 1,421 | $ 1,201 |