Note 18 - Concentrations of Credit and Other Risks	12 Months Ended
Dec. 31, 2025
Disclosure Text Block [Abstract]
Concentrations of Credit and Other Risks	17. Concentrations of Credit and Other Risks The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash, cash equivalents, accounts receivable and short-term investments. The Company routinely assesses the financial strength of its receivables and provides an allowance for doubtful accounts as necessary. At December 31, 2025 and 2024, the allowance was approximately $0.4 million and $0.5 million, respectively. The Company currently obtains nearly all of its supply of Thorium-228 (a precursor to 212Pb) from a single supplier, the DOE. The Company currently utilizes one vendor for the manufacture of resin chromatography columns that are used in its 212Pb generators, and the Company relies on a single vendor to assemble and load isotopes into the generators that are used to extract 212Pb for use in the doses for the Company’s clinical trials.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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