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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-based compensation expense $ 48,771 $ 77,396 $ 105,564 $ 148,771
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 39,383 59,966 87,025 115,419
Research and Development Expense [Member]        
Share-based compensation expense $ 9,388 $ 17,430 $ 18,539 $ 33,352