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Note 8 - Outstanding Warrants (Details Textual) - $ / shares | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 11.78 | $ 15.92
Warrants and Rights Outstanding, Term (Year) | 6 years 4 months 24 days | 7 years 5 months 23 days
Warrants to Purchase Common Stock [Member] |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 100,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 2.50 |
Warrants and Rights Outstanding, Term (Year) | 2 years |
Stock Issued During Period, Warrants Exercised (in shares) | 62,293 |
Warrants to Purchase Common Stock [Member] | Senior Leaders [Member] |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 160,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 2.00 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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 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 Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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