Note 8 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| The 2017 Omnibus Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | $ 80 | $ 218 |
| SEED 2022 Share Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | 381 | 26 |
| Research and Development Expenses [Member] | The 2017 Omnibus Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | 19 | 26 |
| Research and Development Expenses [Member] | SEED 2022 Share Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | 6 | 8 |
| General and Administrative Expenses [Member] | The 2017 Omnibus Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | 61 | 192 |
| General and Administrative Expenses [Member] | SEED 2022 Share Incentive Plan [Member] | ||
| Allocated Share-based Compensation Expense | $ 375 | $ 18 |