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Note 14 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions | Jan. 09, 2024 $ / shares shares | Dec. 21, 2023 USD ($) $ / shares | Apr. 27, 2023 USD ($) $ / shares | Nov. 15, 2022 | Sep. 09, 2022 USD ($) $ / shares shares | Oct. 29, 2021 shares | Mar. 24, 2024 $ / shares shares | Jan. 29, 2024 $ / shares | Dec. 31, 2023 $ / shares shares | Dec. 31, 2022 $ / shares shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 150,000,000 | 150,000,000
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 5,000,000 |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  |  |  | 1,000 |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  | 35 |  |  |  |  |  |
Subsequent Event [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 15,000 |  |  |  |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 1.3 |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 6,000 | 12,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 6.3 |  |  |  |  |  |  |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  | $ 4.5 |  |  | $ 5.7 |  |  |  |  |
Series B Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 0.25 |  |  |  |  |  |  | $ 0.25 |  |
Series B Preferred Stock [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 75 |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  | $ 1.3 |  |  | $ 14 |  |  |  |  |
Series B Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  | $ 0.25 |  |  | $ 6.3 |  |  |  |  |
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  |  |  | 22,428,000 | 1,847,580
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 15,000 |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 5,607 | 11,620
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.25 | $ 6.3
Series B Preferred Stock [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  |  | $ 1.8 |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 1,000 | 2,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 6.3 |  |  |  |  |  | $ 0.25 |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  | $ 0.5 |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  | 4,000 |
Series C Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  | 2,787,841 |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.14 |  |  |
Preferred Stock, Convertible, Conversion Ratio |  |  |  |  |  |  | 7,143 |  |  |
Series C Preferred Stock [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  | $ 1.3 |  |  |  |  |  |  |  |
Series C Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  | $ 0.25 |  |  |  |  |  |  |  |
Series C Preferred Stock [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  |  | $ 194.0 |  |  |  |  |  |  |
Series C Preferred Stock [Member] | The 2022 Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  |  |  | 4,388,000 | 357,750
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 3,250 |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 1,097 | 2,250
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.25 | $ 6.3

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