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Note 12 - Stockholders' (Deficit) Equity (Details Textual) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 30, 2024 | Mar. 27, 2024 shares | Dec. 21, 2023 USD ($) $ / shares | Apr. 27, 2023 USD ($) $ / shares | Sep. 09, 2022 USD ($) $ / shares shares | Oct. 29, 2021 shares | Mar. 31, 2024 USD ($) $ / shares | Jun. 30, 2024 $ / shares shares | May 27, 2024 | Jan. 29, 2024 $ / shares | Dec. 31, 2023 shares | Jun. 30, 2023 $ / shares shares
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 |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  | 0 |  |  | 1 |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 45.5 |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  | 1,000 |  |  | 6,000 |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 220.5 |  |  |  |  |  | $ 8.75 |  |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  |  | $ 4.5 |  | $ 5.7 |  |  |  |  |  |  |
Series B Preferred Stock [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 |  |  | $ 45.5 |  | $ 490 |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 8.75 |  | $ 220.5 |  |  |  |  |  |  |
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  |  | 15,065 |  |  |  | 201,432
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 15,000 |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  | 131 |  |  |  | 9,156
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 8.75 |  |  |  | $ 45.5
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] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 3,250 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 220.5 |  |  |  |  |  |  |  |
Preferred Stock, Change in Conversion Price, Income Statement Impact | $ |  |  | $ 0.5 |  |  |  | $ 0.4 |  |  |  |  |
Series C Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  | 75 |  |  |
Series C Preferred Stock [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 45.5 |  |  |  | $ 8.75 |  |  |  |  |
Series C Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 8.75 |  |  |  | $ 4.9 |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  | 24,134
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 3,250 |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  | 0 |  |  |  | 1,097
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 45.5
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 35 |  |  |  |  |  |  | 35 |  |  |  |

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