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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Share-based compensation expense $ 77,396 $ 83,699 $ 148,771 $ 193,396
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 59,966 66,152 115,419 158,578
Research and Development Expense [Member]        
Share-based compensation expense $ 17,430 $ 17,547 $ 33,352 $ 34,818