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Note 5 - Share-based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-based compensation expense $ 21,837 $ 48,771 $ 74,325 $ 105,564
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 17,715 39,383 62,546 87,025
Research and Development Expense [Member]        
Share-based compensation expense $ 4,122 $ 9,388 $ 11,779 $ 18,539