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Note 8 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based payment arrangement $ 77 $ 177 $ 345 $ 565
Research and Development Expense [Member]        
Share-based payment arrangement 42 98 192 315
Selling, General and Administrative Expenses [Member]        
Share-based payment arrangement $ 35 $ 79 $ 153 $ 250