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Note 9 - Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Beginning balance $ 8,413 $ 6,496 $ 5,001
Expired research and development tax credits (665) (50) 0
Additions based on tax positions related to the current year 1,494 1,967 1,495
Ending balance $ 9,242 $ 8,413 $ 6,496