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Note 8 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Research and development $ 170 $ 204
Research and Development Expense [Member]    
Research and development 95 115
Selling, General and Administrative Expenses [Member]    
Research and development $ 75 $ 89