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Note 19 - Subsequent Events (Details Textual) - USD ($) |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 09, 2024 | Jul. 29, 2024 | Jul. 26, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.01 |  | $ 0.01 |
Class of Warrant or Right, Issued During Period |  |  |  | 118,953,000 | 145,056,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 37.4 | $ 76.23 | $ 50.96 | $ 269.54
Proceeds from Warrant Exercises |  |  |  | $ 226,000 | $ 0 |  |
Subsequent Event [Member] | Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 0.01 |  |  |  |
Proceeds from Warrant Exercises | $ 20 |  |  |  |  |  |
Subsequent Event [Member] | Series F-1 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.1 |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 5 years |  |  |  |
Subsequent Event [Member] | Series F-2 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.1 |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 6 months |  |  |  |
Subsequent Event [Member] | Series F-3 Warrants [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 1 year |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,158,566 |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  | 4.99% |  |  |  |
Proceeds from Issuance of Stock and Warrants |  | $ 3,900,000 |  |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] | Election of the holder prior to the date of issuance [Member] |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  | 9.99% |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] | Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 2,041,814 |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] | Series F-1 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 3,200,380 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 3,200,380 |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] | Series F-2 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 3,200,380 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 3,200,380 |  |  |  |
The 2024 Public Offering [Member] | Subsequent Event [Member] | Series F-3 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 3,200,380 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 3,200,380 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 336,832 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 477,272 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-1 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 336,832 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-1 Warrants [Member] | Underwriting Agreement [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 336,832 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-1 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 477,272 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 477,272 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-2 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 336,832 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 336,832 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-2 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 477,272 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 477,272 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-3 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 336,832 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 336,832 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-3 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 477,272 |  |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] | Series F-3 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriting Agreement [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 477,272 |  |  |  |

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