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Note 3 - Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Total property and equipment $ 841,417 $ 841,417
Accumulated depreciation and amortization (623,824) (606,505)
Total property and equipment, net 217,593 234,912
Equipment and Furnishings [Member]    
Total property and equipment 725,812 725,812
Leasehold Improvements [Member]    
Total property and equipment $ 115,605 $ 115,605