Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Operating Lease, Expense | $ 33 | $ 33 | $ 66 | $ 66 | |
| Remaining lease term (in years) (Year) | 1 year 2 months 1 day | 1 year 2 months 1 day | 2 years 2 months 1 day | ||
| Discount rate | 13.29% | 13.29% | 13.29% | ||
| Research and Development [Member] | |||||
| Operating Lease, Expense | $ 11 | 11 | $ 22 | 22 | |
| General and Administrative [Member] | |||||
| Operating Lease, Expense | $ 22 | $ 22 | $ 44 | $ 44 | |