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Note 5 - Share-based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based compensation expense $ 31,660 $ 66,053 $ 105,985 $ 171,617
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 24,920 53,117 87,466 140,142
Research and Development Expense [Member]        
Share-based compensation expense $ 6,740 $ 12,936 $ 18,519 $ 31,475