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Note 2 - Supplemental Balance Sheet Information - Property and Equipment (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Property and equipment, gross   $ 3,555,000 $ 3,020,000
Less accumulated depreciation   (2,968,000) (2,739,000)
Property and equipment, net   $ 587,000 281,000
Equipment [Member]      
Estimated useful life (Year)   5 years  
Property and equipment, gross   $ 322 144,000
Leasehold Improvements [Member]      
Property and equipment, gross   $ 964,000 725,000
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   $ 36,000 16,000
Software and Software Development Costs [Member]      
Estimated useful life (Year)   3 years  
Property and equipment, gross   $ 2,233,000 $ 2,135,000