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Note 4 - Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Computer equipment and software $ 799 $ 789
Less accumulated depreciation (641) (619)
Property and equipment, net 158 170
Computer Equipment and Software [Member]    
Computer equipment and software 171 161
Laboratory and Manufacturing Equipment [Member]    
Computer equipment and software 575 575
Furniture and Fixtures [Member]    
Computer equipment and software 27 27
Leasehold Improvements [Member]    
Computer equipment and software $ 26 $ 26