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Note 2 - Significant Accounting Policies - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Share-based compensation expense $ 3,262 $ 5,062
Research and Development Expense [Member]    
Share-based compensation expense 2,797 3,641
General and Administrative Expense [Member]    
Share-based compensation expense $ 465 $ 1,421