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Note 7 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property and equipment, at cost $ 866 $ 834
Less: accumulated depreciation and amortization (700) (641)
Total property and equipment, net 166 193
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 472 464
Production Equipment [Member]    
Property and equipment, at cost 138 114
Leasehold Improvements [Member]    
Property and equipment, at cost $ 79 $ 79