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Note 2 - Summary of Significant Accounting Policies - Outstanding Stock Options and Stock Warrants Excluded from the Diluted Net Loss Per Share Computation (Details) - shares shares in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Anti-dilutive securities (in shares) | 13,111 | 2,046
Series B Preferred Stock [Member] |  |
Anti-dilutive securities (in shares) | 4,736 | 1,845
Series C Preferred Stock [Member] |  |
Anti-dilutive securities (in shares) | 845 | 0
Share-Based Payment Arrangement, Option [Member] |  |
Anti-dilutive securities (in shares) | 148 | 136
Warrant [Member] |  |
Anti-dilutive securities (in shares) | 7,382 | 65

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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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