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Note 7 - Warrants - Summary of Warrants Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Feb. 11, 2021
Number outstanding/ exercisable (in shares) | 2,850,000 | 2,850,000 |
Warrants Issued in Connection with Private Placement [Member] |  |  |
Number outstanding/ exercisable (in shares) | 2,500,000 |  |
Weighted average remaining life (Year) | 3 years 7 months 13 days |  |
Weighted average exercise price (in dollars per share) | $ 5.10 |  | $ 5.10
The Placement Agent Warrants [Member] |  |  |
Number outstanding/ exercisable (in shares) | 350,000 |  |
Weighted average remaining life (Year) | 3 years 7 months 13 days |  |
Weighted average exercise price (in dollars per share) | $ 6.45 |  | $ 6.45

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Details
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