Note 6 - Sale of Future Payments - Schedule of Future Payment Liabilities (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Liability related to sale of future payments — beginning balance | $ 6,527 | $ 0 |
| Proceeds from sale of future payments, net of issuance costs | 0 | 6,133 |
| Liability related to sale of future payments as of December 31, 2024 | 6,499 | 6,527 |
| XOMA [Member] | ||
| Non-cash revenue | (28) | 0 |
| Non-cash interest expense recognized | $ 0 | $ 394 |