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Note 6 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based compensation expense $ 58,050 $ 54,230 $ 240,321 $ 709,788
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 47,694 51,157 207,342 632,793
Research and Development Expense [Member]        
Share-based compensation expense $ 10,356 $ 3,073 $ 32,979 $ 76,995