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Note 11 - Warrant Liability (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | May 01, 2023 | Apr. 26, 2023 | Nov. 10, 2022 | Sep. 09, 2022 | Jan. 31, 2022 | Dec. 31, 2021
Fair Value Adjustment of Warrants | $ (0) | $ (2,414) | $ (216) | $ (4,470) |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | 1,400 |  | 1,400 |  | $ 1,600 |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | 216 |  |  |  |  |  |  |
September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ 94 |  | 94 |  |  | $ 48 | $ 500 | $ 1,400 |  |
Fair Value Adjustment of Warrants |  |  | $ 46 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 327,860 |  | 327,860 |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ 230 |  | $ 230 |  |  | $ 112 | 1,300 |  | $ 7,500 | $ 9,600
Fair Value Adjustment of Warrants |  |  | $ 117 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 803,574 |  | 803,574 |  |  |  |  |  |  |
The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  |  |  | $ 3,500 |  |
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 | $ 300 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 77,145 |  | 77,145 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding, Accounting for Subsequent Stock Split (in shares) |  |  |  |  |  |  |  | 77,145 |  |

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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 Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 13 -SubTopic 10 -Topic 480 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481766/480-10-25-13 + Details
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