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Note 14 - Merger (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 03, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Nov. 22, 2022
Business Acquisition [Line Items]            
Grant revenue   $ 526 $ 588 $ 851 $ 821  
Operating loss   (14,263) (9,754) (27,268) (19,515)  
Viewpoint Molecular Targeting, Inc. [Member]            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interests acquired 100.00%          
Business acquisition, number of common shares exchanged 13,654,507          
Business combination, fair value of common stock $ 54,618          
Business acquisition, closing market price $ 4          
Note receivable, forgiven amount $ 6,200          
Grant revenue   500 600 900 800  
Operating loss   $ (13,600) $ (7,300) $ (23,700) $ (11,100)  
Viewpoint Molecular Targeting, Inc. [Member] | Isoray Note [Member]            
Business Acquisition [Line Items]            
Note receivable, forgiven amount, loan           $ 6,000
Accrued interest           $ 200