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Note 7 - Stockholders' Equity and Stock-based Compensation Expense - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total stock-based compensation expense $ 2,604 $ 835 $ 4,939 $ 1,508
Research and Development Expense [Member]        
Total stock-based compensation expense 972 392 1,945 781
General and Administrative Expense [Member]        
Total stock-based compensation expense $ 1,632 $ 443 $ 2,994 $ 727