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Note 2 - Significant Accounting Policies - Potentially Dilutive Securities Not Included in Calculation of Diluted Net Loss per Share (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Anti-dilutive securities not included in calculation of diluted net loss per share (in shares) | 5,293,021 | 6,717,964 | 6,189,484 | 6,717,964
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Anti-dilutive securities not included in calculation of diluted net loss per share (in shares) | 2,947,276 | 3,850,575 | 3,718,413 | 3,850,575
Warrant [Member] |  |  |  |
Anti-dilutive securities not included in calculation of diluted net loss per share (in shares) | 2,116,250 | 2,116,250 | 2,116,250 | 2,116,250
Unvested Restricted Stock Units [Member] |  |  |  |
Anti-dilutive securities not included in calculation of diluted net loss per share (in shares) | 229,495 | 751,139 | 354,821 | 751,139

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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