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Note 11 - Related Parties (Detailed Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 08, 2025 | Jan. 08, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |
Other income from a related party |  |  | $ 0 | $ 1,400 |
Lantheus Investment Agreement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Shares issued and sell |  | 5,634,235 |  |  |
Percent of outstanding shares |  | 19.99% |  |  |
Lantheus Investment Agreement [Member] | Option Agreement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
One-time payment received for rights granted |  | $ 28,000 |  |  |
Percent of outstanding shares |  |  |  |  | 19.90%
Other income from a related party | $ 1,400 |  |  |  |
Lantheus Alpha Therapy, LLC [Member] | Lantheus Investment Agreement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Shares issued and sell |  | 5,634,235 |  |  |
Percent of outstanding shares |  | 19.99% |  |  |

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