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Note 6 - Net Loss Per Share - Schedule of Antidilutive Securities (Details) - shares | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Share-Based Payment Arrangement, Option [Member] |  |  |
Antidilutive Securities (in shares) |  | 0 | 250
Convertible Series F Preferred Stock [Member] |  |  |
Antidilutive Securities (in shares) | [1] | 52,512 | 98,689
Series F Preferred Warrants [Member] |  |  |
Antidilutive Securities (in shares) | [2] | 2,784,921 | 2,932,486
Common Stock Warrants [Member] |  |  |
Antidilutive Securities (in shares) |  | 2,262,203 | 2,071,860
[1] | Calculation assumes conversion of the stated value, and accrued dividends, of the Series F Preferred Stock into Common Stock at the Floor Price of $11.17.
[2] | Calculation assumes exercise of the Series F Preferred Warrants for cash into Series F Preferred Stock and subsequent conversion of the Series F Preferred Stock into Common Stock at the Floor Price of $11.17.

X
- 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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