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Note 7 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property and equipment, at cost $ 834 $ 686
Less: accumulated depreciation and amortization (641) (602)
Total property and equipment, net 193 84
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 464 365
Production Equipment [Member]    
Property and equipment, at cost 114 65
Leasehold Improvements [Member]    
Property and equipment, at cost $ 79 $ 79