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Note 4 - Property and Equipment, Net - Equipment, Furniture, and Leasehold Improvements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property and equipment, gross $ 4,304 $ 5,698
Less: Accumulated depreciation and amortization (2,750) (2,939)
Property and equipment, net $ 1,554 2,759 [1]
Equipment [Member]    
Property, Plant and Equipment, Useful Life (Year) 5 years  
Property and equipment, gross $ 2,628 3,111
Rental Program Equipment [Member]    
Property, Plant and Equipment, Useful Life (Year) 5 years  
Property and equipment, gross $ 1,118 1,812
Computer Equipment [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Property and equipment, gross $ 157 242
Leasehold Improvements [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Property and equipment, gross $ 122 122
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Useful Life (Year) 7 years  
Property and equipment, gross $ 244 386
Software [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Property and equipment, gross $ 35 $ 25
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.