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Note 9 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Stock-based compensation expense $ 8,560 $ 6,120
Research and Development Expense [Member]    
Stock-based compensation expense 2,971 1,998
General and Administrative Expense [Member]    
Stock-based compensation expense $ 5,589 $ 4,122