Note 10 - Commitments and Contingencies	3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies The Company has been in settlement negotiations with a representative for six stockholder plaintiff firms alleging the Company violated Delaware law in its preliminary proxy statement that was disseminated to stockholders in November 2022 for the Company’s annual meeting held in December 2022. Based on these settlement negotiations to date, the Company estimates that it will settle for no more than an aggregate of $0.2 million and, therefore, had an accrual for the estimated liability of $0.2 million as of March 31, 2026 and December 31, 2025. This balance is included in accrued expenses on the unaudited Condensed Consolidated Balance Sheets. In May 2025 and May 2026, the Company entered into supply agreements with the U.S. Department of Energy (DOE) under which the Company will purchase Thorium-228 from the DOE between 2025 and 2027. As of March 31, 2026, the Company has met and been invoiced for its minimum purchase requirements under the May 2025 supply agreement. The May 2026 supply agreement includes a “take-or-pay” provision pursuant to which the Company is committed to purchasing approximately $9.9 million of Thorium-228 during the term of the agreement. In October 2025 and April 2026, the Company entered into agreements with a general contractor pursuant to which the Company is expected to pay approximately $34.4 million. The first agreement is for the general contractor to make building modifications at the Company’s facility in the Chicago, IL, metropolitan area and to prepare for the installation of some of the Comecer manufacturing equipment and associated clean rooms at that site. The second agreement is for the general contractor to order long-lead time items and to prepare to make modifications to the Company’s facility in the Los Angeles, CA metropolitan area, including for the eventual installation of some of the Comecer manufacturing equipment and associated clean rooms at that site. The Company anticipates incurring additional spending with this general contractor, particularly in connection with the build out of the facility in the Los Angeles, CA metropolitan area.

Note 10 - Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

10.

Commitments and Contingencies

The Company has been in settlement negotiations with a representative for six stockholder plaintiff firms alleging the Company violated Delaware law in its preliminary proxy statement that was disseminated to stockholders in November 2022 for the Company’s annual meeting held in December 2022. Based on these settlement negotiations to date, the Company estimates that it will settle for no more than an aggregate of $0.2 million and, therefore, had an accrual for the estimated liability of $0.2 million as of March 31, 2026 and December 31, 2025. This balance is included in accrued expenses on the unaudited Condensed Consolidated Balance Sheets.

In May 2025 and May 2026, the Company entered into supply agreements with the U.S. Department of Energy (DOE) under which the Company will purchase Thorium-228 from the DOE between 2025 and 2027. As of March 31, 2026, the Company has met and been invoiced for its minimum purchase requirements under the May 2025 supply agreement. The May 2026 supply agreement includes a “take-or-pay” provision pursuant to which the Company is committed to purchasing approximately $9.9 million of Thorium-228 during the term of the agreement.

In October 2025 and April 2026, the Company entered into agreements with a general contractor pursuant to which the Company is expected to pay approximately $34.4 million. The first agreement is for the general contractor to make building modifications at the Company’s facility in the Chicago, IL, metropolitan area and to prepare for the installation of some of the Comecer manufacturing equipment and associated clean rooms at that site. The second agreement is for the general contractor to order long-lead time items and to prepare to make modifications to the Company’s facility in the Los Angeles, CA metropolitan area, including for the eventual installation of some of the Comecer manufacturing equipment and associated clean rooms at that site. The Company anticipates incurring additional spending with this general contractor, particularly in connection with the build out of the facility in the Los Angeles, CA metropolitan area.