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Note 13 - Common Stock Warrants (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Warrants |  |  | Weighted- Average Exercise Price |
Outstanding at December 31, 2021 |  |  | 202,333 |  |  | $ | 57.13 |
Warrants granted |  |  | 2,431,046 |  |  |  | 11.70 |
Warrants exercised |  |  | (327,860 | ) |  |  | 6.30 |
Warrants expired |  |  | — |  |  |  | — |
Outstanding at December 31, 2022 |  |  | 2,305,519 |  |  | $ | 7.70 |
Warrants granted |  |  | 7,605,776 |  |  |  | 0.95 |
Warrants exercised |  |  | (2,528,848 | ) |  |  | 0.25 |
Warrants expired |  |  | — |  |  |  | — |
Outstanding at December 31, 2023 |  |  | 7,382,447 |  |  |  | 1.82 |
Schedule of Stockholders' Equity Note, Warrants or Rights Outstanding, Activity [Table Text Block] |
Series |  | Exercise Price |  | Expiration Date |  | Warrants |
2019 Ladenburg Warrants |  | $ | 34.65 |  | August 8, 2024 |  |  | 4,799 |
July 2020 Warrants |  | $ | 57.75 |  | January 22, 2026 |  |  | 59,960 |
July 2020 Warrants |  | $ | 1.50 |  | January 22, 2026 |  |  | 77,145 |
TLF Warrants |  | $ | 23.51 |  | January 15, 2026 |  |  | 429 |
November 2021 Warrants |  | $ | 6.30 |  | September 11, 2028 |  |  | 267,858 |
November 2021 Warrants |  | $ | 1.50 |  | September 11, 2028 |  |  | 535,716 |
September 2022 Warrants |  | $ | 6.30 |  | September 11, 2028 |  |  | 89,286 |
September 2022 Warrants |  | $ | 1.50 |  | September 11, 2028 |  |  | 238,574 |
November 2022 A-1 Warrants |  | $ | 6.30 |  | November 20, 2028 |  |  | 79,366 |
November 2022 A-1 Warrants |  | $ | 1.50 |  | November 20, 2028 |  |  | 436,510 |
November 2022 A-2 Warrants |  | $ | 6.30 |  | May 20, 2024 |  |  | 79,366 |
November 2022 A-2 Warrants |  | $ | 1.50 |  | May 20, 2024 |  |  | 436,510 |
May 2023 B-1 Warrants |  | $ | 0.25 |  | June 9, 2028 |  |  | 1,903,848 |
May 2023 B-2 Warrants |  | $ | 0.25 |  | June 9, 2025 |  |  | 644,232 |
December 2023 Warrants |  | $ | 0.25 |  | June 21, 2029 |  |  | 2,528,848 |
Outstanding at December 31, 2023 |  |  |  |  |  |  |  | 7,382,447 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
Fair value of warrant liability recognized for November 2021 Warrants as of December 31, 2021 |  | $ | 9,558 |
Decrease in fair value of November 2021 Warrants liability |  |  | (2,056 | )
Reclassification of November 2021 Warrants liability to equity |  |  | (7,502 | )
Fair value of warrant liabilities recognized in connection with the 2022 Warrant Reprice Transaction |  |  | 5,241 |
Decrease in fair value of 2022 Warrant Reprice Transaction warrant liabilities |  |  | (3,390 | )
Reclassification of 2022 Warrant Reprice Transaction warrant liabilities to equity |  |  | (1,851 | )
Warrant liabilities as of December 31, 2022 |  | $ | — |
Fair value of warrant liability recognized for May 2023 Warrants |  |  | 1,576 |
Decrease in fair value of May 2023 Warrants liability |  |  | (216 | )
Reclassification of May 2023 Warrants liability to equity |  |  | (1,360 | )
Fair value of warrant liability recognized for December 2023 Warrants |  |  | 390 |
Decrease in fair value of December 2023 Warrants liability |  |  | (56 | )
Fair value of December 2023 Warrants liability at December 31, 2023 |  | $ | 334 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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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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