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Note 6 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-based compensation expense $ 100,746 $ 58,050 $ 294,143 $ 240,321
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 77,542 47,694 236,120 207,342
Research and Development Expense [Member]        
Share-based compensation expense $ 23,204 $ 10,356 $ 58,023 $ 32,979