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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based compensation expense | $ 83,699 | $ 41,123 | $ 193,396 | $ 182,271
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation expense | 66,152 | 30,704 | 158,578 | 159,648
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | $ 17,547 | $ 10,419 | $ 34,818 | $ 22,623

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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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