Note 11 - Leases (Details Textual) $ in Thousands		12 Months Ended
	Aug. 08, 2024 USD ($) RenewalOption	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Nov. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Apr. 01, 2024 USD ($)	Mar. 01, 2024 USD ($)	Jul. 01, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Lease liability		$ 1,628
Right of use asset		$ 1,500	$ 2,215
Lease term	52 months
Operating lease, weighted average remaining term		2 years 7 months 6 days
Operating lease, weighted average discount rate		8.00%
Operating lease, expense		$ 100	800
Estimated reduction of reserve from hazardous waste disposal vendor		300			$ 300
Estimated hazardous waste removal liability		$ 200	$ 500
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				$ 200		$ 1,100
Right of use asset				$ 200		$ 1,100
Lessee, operating lease, discount rate				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%