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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Share-based compensation expense | $ 71,375 | $ 109,697 | $ 387,907 | $ 314,715
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation expense | 55,453 | 92,426 | 310,017 | 269,368
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | $ 15,922 | $ 17,271 | $ 77,890 | $ 45,347

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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