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Note 3 - Balance Sheet Components - Schedule of Property and Equipment (10-K) (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Total property and equipment $ 890,363 $ 890,363 $ 841,417
Accumulated depreciation and amortization (719,826) (680,674) (606,505)
Total property and equipment, net 170,537 209,689 234,912
Equipment and Furnishings [Member]      
Total property and equipment 774,758 774,758 725,812
Leasehold Improvements [Member]      
Total property and equipment $ 115,605 $ 115,605 $ 115,605