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Note 12 - Leases (Details Textual) $ in Thousands |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2024 USD ($) RenewalOption | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Feb. 28, 2026 USD ($) | Dec. 31, 2025 USD ($) | Nov. 30, 2025 USD ($) | Apr. 01, 2024 USD ($) | Mar. 01, 2024 USD ($) | Jul. 01, 2023 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Lease liability |  | $ 2,621 |  |  |  |  |  |  |
Right of use asset |  | $ 2,444 |  |  | $ 1,500 |  |  |  |
Lease term | 52 months |  |  |  |  |  |  |  |
Operating lease, weighted average remaining term |  | 2 years 3 months 18 days |  |  |  |  |  |  |
Operating lease, weighted average discount rate |  | 8.00% |  |  |  |  |  |  |
Operating lease, expense |  | $ 300 | $ 300 |  |  |  |  |  |
Lantheus Alpha Therapy, LLC [Member] |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Number of renewal options | RenewalOption | 0 |  |  |  |  |  |  |  |
Maximum [Member] | Lantheus Alpha Therapy, LLC [Member] |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Base prepaid rent | $ 100 |  |  |  |  |  |  |  |
Office Space in Seattle WA [Member] |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Lease liability |  |  |  |  |  |  |  |  | $ 800
Right of use asset |  |  |  |  |  |  |  |  | $ 800
Lessee, operating lease, discount rate |  |  |  |  |  |  |  |  | 8.00%
Coralville, IA [Member] |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Lease liability |  |  |  | $ 1,300 |  | $ 200 | $ 1,100 |  |
Right of use asset |  |  |  | $ 1,300 |  | $ 200 | $ 1,100 |  |
Lessee, operating lease, discount rate |  |  |  | 8.00% |  | 8.00% | 8.00% |  |
Progenics [Member] |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Lease liability | 600 |  |  |  |  |  |  | $ 300 |
Right of use asset | $ 600 |  |  |  |  |  |  | $ 300 |
Lessee, operating lease, discount rate | 8.00% |  |  |  |  |  |  | 8.00% |

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