v3.25.2
Note 5 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Statement Line Items [Line Items]      
Grant $ 0.1   $ 0.1
MSD [member]      
Statement Line Items [Line Items]      
Revenue from contracts with customers $ 0.1 $ 0.1 $ 0.1