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Note 6 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based compensation expense | $ 142,839 | $ 131,054 | $ 655,558 | $ 657,088
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation expense | 140,328 | 115,526 | 581,636 | 568,613
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | $ 2,511 | $ 15,528 | $ 73,922 | $ 88,475

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