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Note 6 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation expense | $ 54,230 | $ 137,101 | $ 709,788 | $ 794,189
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation expense | 51,157 | 121,999 | 632,793 | 690,612
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | $ 3,073 | $ 15,102 | $ 76,995 | $ 103,577

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