Note 8 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| The 2017 Omnibus Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | $ 80 | $ 123 | $ 160 | $ 341 |
| SEED 2022 Share Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | 495 | 22 | 876 | 48 |
| Research and Development Expenses [Member] | The 2017 Omnibus Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | 16 | 28 | 35 | 54 |
| Research and Development Expenses [Member] | SEED 2022 Share Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | 73 | 7 | 79 | 15 |
| General and Administrative Expenses [Member] | The 2017 Omnibus Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | 64 | 95 | 125 | 287 |
| General and Administrative Expenses [Member] | SEED 2022 Share Incentive Plan [Member] | ||||
| Allocated Share-based Compensation Expense | $ 422 | $ 15 | $ 797 | $ 33 |