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Note 12 - Stockholders' Equity - The Key Assumptions Used to Value the Warrants (Details) | Jun. 30, 2023 | Apr. 27, 2023 | Apr. 26, 2023 | Nov. 10, 2022 | Sep. 09, 2022 | Sep. 08, 2022
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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, Price Volatility [Member] | September 2022 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.801 |  | 0.801 | 0.795 | 0.796 |
Measurement Input, Price Volatility [Member] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.801 | 0.801 |  |  |  |
Measurement Input, Price Volatility [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.801 | 0.801 |  |  |  |
Measurement Input, Share Price [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.72 | 0.72 |  | 1.40 | 4.55 | 3.15
Measurement Input, Share Price [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.72 | 0.72 |  | 1.05 | 3.50 | 0.70
Measurement Input, Share Price [Member] | September 2022 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.72 |  | 0.72 | 1.40 | 4.55 |
Measurement Input, Share Price [Member] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.72 | 0.72 |  |  |  |
Measurement Input, Share Price [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.72 | 0.72 |  |  |  |
Measurement Input, Expected Term [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 5.4 | 5.4 |  | 5.8 | 6.0 | 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, Expected Term [Member] | September 2022 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 5.4 |  | 5.4 | 5.8 | 6.0 |
Measurement Input, Expected Term [Member] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 5.6 | 5.6 |  |  |  |
Measurement Input, Expected Term [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 1.1 | 1.1 |  |  |  |
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, 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] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0359 | 0.0359 |  |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0473 | 0.0473 |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0000 | 0.0000 |  | 0.0000 | 0.0000 | 0.0000
Measurement Input, Expected Dividend Rate [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0000 | 0.0000 |  | 0.0000 | 0.0000 | 0.0000
Measurement Input, Expected Dividend Rate [Member] | September 2022 Warrants [Member] |  |  |  |  |  |
Warrants assumptions |  |  | 0.000 | 0.000 | 0.000 |
Measurement Input, Expected Dividend Rate [Member] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0000 | 0.0000 |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.0000 | 0.0000 |  |  |  |
Weighted Average Fair Value [Member] | The November 2021 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.39 | 0.20 |  |  |  |
Weighted Average Fair Value [Member] | Amended July 2020 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.24 | 0.06 |  |  |  |
Weighted Average Fair Value [Member] | September 2022 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.39 |  | 0.20 |  |  |
Weighted Average Fair Value [Member] | Series A-1 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.40 | 0.21 |  |  |  |
Weighted Average Fair Value [Member] | Series A-2 Warrants [Member] |  |  |  |  |  |
Warrants assumptions | 0.09 | 0.00 |  |  |  |

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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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