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Note 2 - Supplemental Balance Sheet Information - Property and Equipment (Details) - USD ($)
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Property and equipment, gross $ 3,142,000 $ 3,020,000
Less accumulated depreciation (2,873,000) (2,739,000)
Property and equipment, net $ 269,000 281,000
Equipment [Member]    
Estimated useful life (Year) 5 years  
Property and equipment, gross $ 255 144,000
Leasehold Improvements [Member]    
Property and equipment, gross $ 725,000 725,000
Leasehold Improvements [Member] | Minimum [Member]    
Estimated useful life (Year) 2 years  
Leasehold Improvements [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years  
Furniture and Fixtures [Member]    
Estimated useful life (Year) 7 years  
Property and equipment, gross $ 16,000 16,000
Software and Software Development Costs [Member]    
Estimated useful life (Year) 3 years  
Property and equipment, gross $ 2,146,000 $ 2,135,000