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Note 3 - Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Property and equipment, gross $ 789,542 $ 707,159
Accumulated depreciation and amortization (574,759) (550,221)
Total property and equipment, net 214,783 156,938
Equipment and Furnishings [Member]    
Property and equipment, gross 673,937 591,554
Leasehold Improvements [Member]    
Property and equipment, gross $ 115,605 $ 115,605