Note 9 - Accrued Liabilities - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Accrued personnel related costs	$ 982	$ 1,989
Accrued research and development expenses	1,647	6,527
Other accrued expenses	144	313
Total	$ 2,773	$ 8,829