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Note 6 - Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Total stock-based compensation expense |  |  |  |  | $ 1,074,957 | $ 902,074
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Total stock-based compensation expense | $ 101,640 | $ 226,013 | $ 205,209 | $ 454,052 | 855,124 | 773,377
Share-Based Payment Arrangement, Option [Member] | Research and Development Expense [Member] |  |  |  |  |  |
Total stock-based compensation expense |  |  |  |  | 291,094 | 225,031
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member] |  |  |  |  |  |
Total stock-based compensation expense |  |  |  |  | 564,030 | 548,346
Restricted Stock [Member] | General and Administrative Expense [Member] |  |  |  |  |  |
Total stock-based compensation expense |  |  |  |  | $ 219,833 | $ 128,697

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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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