Note 3 - Fair Value of Financial Instruments - Fair Values of Derivative Liabilities (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Embedded Derivative Financial Instruments [Member] | |||
| Beginning balance | $ 0 | $ 6,759 | $ 0 |
| Initial fair value of derivative liabilities at issuance | 4,447 | 2,468 | |
| Change in fair value | 7,040 | 4,291 | |
| Derecognition of derivative liability | (18,246) | ||
| Ending balance | 0 | 6,759 | |
| Senior Secured Note [Member] | |||
| Beginning balance | 5,448 | 0 | |
| Initial fair value of derivative liabilities at issuance | 5,437 | ||
| Change in fair value | 145 | 11 | |
| Derecognition of derivative liability | 7,379 | ||
| Ending balance | 2,157 | 5,448 | 0 |
| Warrant Liability [Member] | |||
| Beginning balance | 7,842 | 0 | |
| Initial fair value of derivative liabilities at issuance | 8,870 | ||
| Change in fair value | (3,143) | (1,028) | |
| Derecognition of derivative liability | (0) | ||
| Ending balance | $ 4,699 | $ 7,842 | $ 0 |