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Note 2 - Significant Accounting Policies - Antidilutive Securities (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Antidilutive securities (in shares) | 17,832,323 | 17,107,636 | 17,832,323 | 17,107,636
Common Stock Warrants [Member] |  |  |  |
Antidilutive securities (in shares) | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000
Placement Agent Warrants [Member] |  |  |  |
Antidilutive securities (in shares) | 80,000 | 80,000 | 80,000 | 80,000
Series A Warrants [Member] |  |  |  |
Antidilutive securities (in shares) | 14,450,069 | 14,450,069 | 14,450,069 | 14,450,069
Unvested Common Stock Grants [Member] |  |  |  |
Antidilutive securities (in shares) | 1,302,254 | 577,567 | 1,302,254 | 577,567

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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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