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Note 6 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurements at June 30, 2025 |
|  | Quoted Prices in |  |  | Other |  |  | Significant |  |  |  |  |
|  | Active Markets for |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Identical Assets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Derivative liabilities -Series A warrants |  | $ | — |  |  | $ | — |  |  | $ | 128,000 |  |  | $ | 128,000 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 128,000 |  |  | $ | 128,000 |
|  | Fair Value Measurements at December 31, 2024 |
|  | Quoted Prices in |  |  | Other |  |  | Significant |  |  |  |  |
|  | Active Markets for |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Identical Assets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Derivative liabilities -Series A and B warrants |  | $ | — |  |  | $ | — |  |  | $ | 16,400,000 |  |  | $ | 16,400,000 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 16,400,000 |  |  | $ | 16,400,000 |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
Exercise price |  | $ | — |  |  | $ | 1.9445 |
Stock price |  | $ | 1.03 |  |  | $ | 3.47 |
Expected term (years) |  |  | 4.25 |  |  |  | 4.75 |
Volatility |  |  | 131.98 | % |  |  | 133.00 | %
Risk-free rate |  |  | 3.74 | % |  |  | 4.28 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Probability of capital raise below exercise price |  |  | 0.00 | % |  |  | 100 | %
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
|  | Amount |
Balance as of December 31, 2024 |  | $ | 16,400,000 |
Amended Series B warrants reclassified to stockholders' equity |  |  | (7,766,000 | )
Change in fair value of warrant liabilities |  |  | (8,506,000 | )
Balance as of June 30, 2025 |  | $ | 128,000 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: 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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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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