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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, 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

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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