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Note 11 - Warrant Liability - The Key Assumptions Used to Value the Warrants (Details) | Sep. 30, 2023 | May 01, 2023 | Apr. 27, 2023 | Apr. 26, 2023 | Nov. 10, 2022 | Sep. 09, 2022 | Sep. 08, 2022 | Jun. 09, 2022 | Jan. 31, 2022 | Nov. 02, 2021
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Measurement Input, Share Price [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.72 |  |  |  |  |  | 0.68 |  |
Measurement Input, Share Price [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.72 |  |  |  |  |  | 0.68 |  |
Measurement Input, Share Price [Member] | September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.72 |  |  | 0.72 | 1.4 | 4.55 |  |  |  |
Measurement Input, Share Price [Member] | The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  |  |  |  | 7 | 8.75
Measurement Input, Share Price [Member] | The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  | 4.55 |  |  |  |
Measurement Input, Share Price [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.72 |  | 0.72 |  | 1.4 | 4.55 | 3.15 |  |  |
Measurement Input, Share Price [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.72 |  | 0.72 |  | 1.05 | 3.5 | 0.7 |  |  |
Measurement Input, Price Volatility [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.801 |  |  |  |  |  | 0.776 |  |
Measurement Input, Price Volatility [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.801 |  |  |  |  |  | 0.776 |  |
Measurement Input, Price Volatility [Member] | September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.801 |  |  | 0.801 | 0.795 | 0.796 |  |  |  |
Measurement Input, Price Volatility [Member] | The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  |  |  |  | 0.91 | 0.87
Measurement Input, Price Volatility [Member] | The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  | 0.796 |  |  |  |
Measurement Input, Price Volatility [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.801 |  | 0.801 |  | 0.795 | 0.796 | 0.796 |  |  |
Measurement Input, Price Volatility [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.801 |  | 0.801 |  | 0.795 | 0.796 | 0.796 |  |  |
Measurement Input, Expected Term [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 5.1 |  |  |  |  |  | 5 |  |
Measurement Input, Expected Term [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 2.1 |  |  |  |  |  | 2 |  |
Measurement Input, Expected Term [Member] | September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 5.4 |  |  | 5.4 | 5.8 | 6 |  |  |  |
Measurement Input, Expected Term [Member] | The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  |  |  |  | 6 | 6
Measurement Input, Expected Term [Member] | The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  | 6 |  |  |  |
Measurement Input, Expected Term [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 5.4 |  | 5.4 |  | 5.8 | 6 | 5.4 |  |  |
Measurement Input, Expected Term [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 2.7 |  | 2.7 |  | 3.2 | 3.4 | 3.4 |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.036 |  |  |  |  |  | 0.0392 |  |
Measurement Input, Risk Free Interest Rate [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.0404 |  |  |  |  |  | 0.0459 |  |
Measurement Input, Risk Free Interest Rate [Member] | September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.0359 |  |  | 0.0359 | 0.0393 | 0.0343 |  |  |  |
Measurement Input, Risk Free Interest Rate [Member] | The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  |  |  |  | 0.0165 | 0.0131
Measurement Input, Risk Free Interest Rate [Member] | The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  | 0.0343 |  |  |  |
Measurement Input, Risk Free Interest Rate [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.0359 |  | 0.0359 |  | 0.0393 | 0.0343 | 0.0343 |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0.0388 |  | 0.0388 |  | 0.0415 | 0.0358 | 0.0358 |  |  |
Measurement Input, Expected Dividend Rate [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0 |  |  |  |  |  | 0 |  |
Measurement Input, Expected Dividend Rate [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0 |  |  |  |  |  | 0 |  |
Measurement Input, Expected Dividend Rate [Member] | September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0 |  |  | 0 | 0 | 0 |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  |  |  |  | 0 | 0
Measurement Input, Expected Dividend Rate [Member] | The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  |  |  |  |  | 0 |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0 |  | 0 |  | 0 | 0 | 0 |  |  |
Measurement Input, Expected Dividend Rate [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions | 0 |  | 0 |  | 0 | 0 | 0 |  |  |
Warrant Fair Value [Member] | Series B-1 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.4 |  |  |  |  |  | 0.36 |  |
Warrant Fair Value [Member] | Series B-2 Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants assumptions |  | 0.22 |  |  |  |  |  | 0.18 |  |

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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