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Note 11 - Stockholders' Equity (Deficit) (Details Textual) - $ / shares | Sep. 09, 2022 | Oct. 29, 2021 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Jan. 29, 2024
--- | --- | --- | --- | --- | --- | ---
Common Stock, Shares Authorized (in shares) |  |  | 150,000,000 | 150,000,000 |  |
Preferred Stock, Shares Authorized (in shares) |  |  | 5,000,000 | 5,000,000 |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  | 1,000 |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 1,000 | 1,000 |  |
Series B Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |
Preferred Stock, Convertible, Percent of Issued Shares Converted |  |  |  |  |  | 75.00%
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 15,000 |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 131 |  | 131 |
Series B Preferred Stock, Post-split [Member] |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  | $ 8.75
Series B Preferred Stock, Post-split [Member] | The 2021 Private Placement Program [Member] |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  | 15,065 |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  | $ 8.75 |  |  |
Series C Preferred Stock [Member] | The 2022 Private Placement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,250 |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 0 |  |  |

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