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Note 8 - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Property and equipment, gross $ 4,485 $ 4,447
Less: accumulated depreciation and amortization (3,575) (3,150)
Property and equipment, net 910 1,297
Laboratory Equipment [Member]    
Property and equipment, gross 456 452
Computers and Software [Member]    
Property and equipment, gross 2,195 2,168
Furniture [Member[    
Property and equipment, gross 610 602
Leasehold Improvements [Member]    
Property and equipment, gross 617 617
Manufacturing Equipment [Member]    
Property and equipment, gross $ 607 $ 608