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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Antidilutive securities (in shares) | 13,509,697 | 18,185,012
Warrant [Member] |  |
Antidilutive securities (in shares) | 205,953 | 5,857,680
Share-Based Payment Arrangement, Option [Member] |  |
Antidilutive securities (in shares) | 13,303,744 | 12,327,332

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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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