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Note 6 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Property and equipment, at cost $ 758 $ 741
Less: accumulated depreciation (661) (622)
Total property and equipment, net 97 119
Office and Laboratory Equipment [Member]    
Property and equipment, at cost 20 20
Furniture and Fixtures [Member]    
Property and equipment, at cost 157 157
Computer Equipment and Software [Member]    
Property and equipment, at cost 429 412
Leasehold Improvements [Member]    
Property and equipment, at cost $ 152 $ 152