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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-based compensation expense $ 71,820 $ 83,699 $ 220,591 $ 193,396
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 56,414 66,152 171,833 158,578
Research and Development Expense [Member]        
Share-based compensation expense $ 15,406 $ 17,547 $ 48,758 $ 34,818