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Note 7 - Warrants (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 11, 2021 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($)
Class of Warrant or Right, Number of Warrants Issued (in shares) |  | 0 |
Proceeds from Issuance of Private Placement | $ |  | $ 0 | $ 25,812
Payments of Stock Issuance Costs | $ | $ 1,783 | $ (0) | $ 1,783
Warrants and Rights Outstanding | $ | $ 7,337 |  |
Measurement Input, Risk Free Interest Rate [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.0059 |  |
Measurement Input, Price Volatility [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.9466 |  |
Measurement Input, Expected Term [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 5.5 |  |
Warrants Issued in Connection with Private Placement [Member] |  |  |
Class of Warrant or Right, Number of Warrants Issued (in shares) | 2,500,000 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,500,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.10 | $ 5.10 |
Warrants and Rights Outstanding, Term (Year) | 5 years 6 months |  |
The Placement Agent Warrants [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 350,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 6.45 | $ 6.45 |
Warrants and Rights Outstanding, Term (Year) | 5 years 6 months |  |
Private Placement [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 5,000,000 |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 5.1625 |  |
Proceeds from Issuance of Private Placement | $ | $ 25,812 |  |
Payments of Stock Issuance Costs | $ | $ 1,783 |  |
Private Placement [Member] | Warrants Issued in Connection with Private Placement [Member] |  |  |
Class of Warrant or Right, Number of Warrants Issued (in shares) | 2,500,000 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,500,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.10 |  |

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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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- 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 -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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