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Note 6 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment, Gross $ 742 $ 760
Less: accumulated depreciation (689) (673)
Total property and equipment, net 53 87
Office and Laboratory Equipment [Member]    
Property, Plant and Equipment, Gross 20 20
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross 157 157
Computer Equipment and Software [Member]    
Property, Plant and Equipment, Gross 413 431
Leasehold Improvements [Member]    
Property, Plant and Equipment, Gross $ 152 $ 152