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Note 12 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Fair Value Assumptions of Warrants [Table Text Block] |
|  | November 2021 Warrants |  |  | July 2020 Warrants |
Expected price volatility |  |  | 79.6 | % |  |  | 79.6 | %
Expected term (in years) |  |  | 5.4 |  |  |  | 3.4 |
Risk-free interest rate |  |  | 3.43 | % |  |  | 3.58 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 3.15 |  |  | $ | 0.70 |
|  | November 2021 Warrants |  |  | July 2020 Warrants |
Expected price volatility |  |  | 79.6 | % |  |  | 79.6 | %
Expected term (in years) |  |  | 6.0 |  |  |  | 3.4 |
Risk-free interest rate |  |  | 3.43 | % |  |  | 3.58 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 4.55 |  |  | $ | 3.50 |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 5.4 |
Risk-free interest rate |  |  | 3.59 | %
Dividend yield |  |  | 0.0 | %
Weighted-average fair value of warrants |  | $ | 0.20 |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 5.4 |
Risk-free interest rate |  |  | 3.59 | %
Dividend yield |  |  | 0.0 | %
Weighted-average fair value of warrants |  | $ | 0.39 |
|  | November 2021 Warrants |  |  | July 2020 Warrants |
Stock price |  | $ | 0.72 |  |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | % |  |  | 80.1 | %
Expected term (in years) |  |  | 5.4 |  |  |  | 2.7 |
Risk-free interest rate |  |  | 3.59 | % |  |  | 3.88 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.20 |  |  | $ | 0.06 |
|  | November 2021 Warrants |  |  | July 2020 Warrants |
Stock price |  | $ | 0.72 |  |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | % |  |  | 80.1 | %
Expected term (in years) |  |  | 5.4 |  |  |  | 2.7 |
Risk-free interest rate |  |  | 3.59 | % |  |  | 3.88 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.39 |  |  | $ | 0.24 |
|  | Series A-1 Warrants |  |  | Series A-2 Warrants |
Stock price |  | $ | 0.72 |  |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | % |  |  | 80.1 | %
Expected term (in years) |  |  | 5.6 |  |  |  | 1.1 |
Risk-free interest rate |  |  | 3.59 | % |  |  | 4.73 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.21 |  |  | $ | 0.00 |
|  | Series A-1 Warrants |  |  | Series A-2 Warrants |
Stock price |  | $ | 0.72 |  |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | % |  |  | 80.1 | %
Expected term (in years) |  |  | 5.6 |  |  |  | 1.1 |
Risk-free interest rate |  |  | 3.59 | % |  |  | 4.73 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.40 |  |  | $ | 0.09 |
Schedule of Preferred Stock Assumptions [Table Text Block] |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 0.8 |
Risk-free interest rate |  |  | 4.91 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 5.35 |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 0.8 |
Risk-free interest rate |  |  | 4.91 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.61 |
Expected price volatility |  |  | 79.6 | %
Expected term (in years) |  |  | 1.3 |
Risk-free interest rate |  |  | 3.64 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 8.05 |
Expected price volatility |  |  | 79.6 | %
Expected term (in years) |  |  | 1.3 |
Risk-free interest rate |  |  | 3.64 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 2.10 |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 0.8 |
Risk-free interest rate |  |  | 4.91 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 5.35 |
Stock price |  | $ | 0.72 |
Expected price volatility |  |  | 80.1 | %
Expected term (in years) |  |  | 0.8 |
Risk-free interest rate |  |  | 4.91 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.61 |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Warrants (in thousands) |  |  | Weighted- Average Exercise Price |
Outstanding at December 31, 2022 |  |  | 2,306 |  |  | $ | 7.70 |
Warrants granted |  |  | 5,076 |  |  |  | 1.30 |
Warrants expired |  |  | — |  |  |  | — |
Outstanding at September 30, 2023 |  |  | 7,382 |  |  |  | 2.18 |

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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 + Details
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