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Note 11 - Warrant Liability (Details Textual) - USD ($) | Mar. 31, 2023 | Nov. 10, 2022 | Sep. 09, 2022 | Jan. 31, 2022 | Dec. 31, 2021
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September 2022 Warrants [Member] |  |  |  |  |
Warrants and Rights Outstanding |  | $ 500,000 | $ 1,400,000 |  |
The November 2021 Warrants [Member] |  |  |  |  |
Warrants and Rights Outstanding |  | $ 1,300,000 |  | $ 7,500,000 | $ 9,600,000
The Amended November 2021 Warrants [Member] |  |  |  |  |
Warrants and Rights Outstanding |  |  | $ 3.5 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 803,574 |  |
Amended July 2020 Warrants [Member] |  |  |  |  |
Warrants and Rights Outstanding | $ 100,000 |  | $ 300,000 |  |
Class of Warrant or Right, Outstanding, Accounting for Subsequent Stock Split (in shares) |  |  | 77,145 |  |

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- Definition Number of warrants or rights outstanding, accounting for subsequent stock split. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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- Details
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