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Note 6 - Stockholders' Equity (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Dec. 31, 2023
Notes Tables |  |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Issue Date |  | Number of Shares |  |  | Exercise Price |  | Expiration
June 2020 |  |  | 4,000 |  |  | $ | 1.68 |  | June 2025
September 2020 |  |  | 159,781 |  |  |  | 75.00 |  | September 2025
February 2021 |  |  | 4,800 |  |  |  | 103.13 |  | August 2024
September 2021 |  |  | 6,668 |  |  |  | 195.00 |  | September 2026
December 2023 |  |  | 582,000 |  |  |  | 1.68 |  | June 2029
May 2024 |  |  | 1,605,688 |  |  |  | 1.68 |  | May 2029
Outstanding at June 30, 2024 |  |  | 2,362,937 |  |  |  |  |  |
Issue Date |  | Number of Shares |  |  | Exercise Price |  |  | Expiration |
June 2020 |  |  | 8,000 |  |  | $ | 6.21 |  |  | June 2025 |
September 2020 |  |  | 159,781 |  |  |  | 75.00 |  |  | September 2025 |
September 2020 |  |  | 8,534 |  |  |  | 82.50 |  |  | March 2024 |
February 2021 |  |  | 4,800 |  |  |  | 103.13 |  |  | August 2024 |
September 2021 |  |  | 6,668 |  |  |  | 195.00 |  |  | September 2026 |
December 2023 |  |  | 507,032 |  |  |  | -0- |  |  | - |
December 2023 |  |  | 1,408,998 |  |  |  | 6.21 |  |  | June 2029 |
Outstanding at December 31, 2022 |  |  | 2,103,813 |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-1 + Details
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