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Note 11 - Financing Activities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 09, 2024 | Jul. 29, 2024 | Jul. 26, 2024 | Dec. 21, 2023 | May 01, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | May 31, 2023 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 27, 2024 | Jul. 06, 2024 | May 30, 2024 | Dec. 31, 2022
Class of Warrant or Right, Issued During Period |  |  |  |  |  |  |  |  |  | 10,730,589,000 | 217,312,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 50.96 |  |  | $ 1.41 | $ 50.96 |  |  |  | $ 269.54
Class of Warrant or Right, Exercised During Period |  |  |  |  |  |  |  |  |  | 90,381,000 | 72,252,000 |  |  |  |
Modification of Warrants |  |  |  |  |  |  |  |  |  | $ 69 | $ 292 |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  |  |  |  |  | $ (114) | $ (272) |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | 3,300 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |
Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  |  | 2,041,814 |  |  |  |  |  |  | 2,041,814,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 0.01 |  |  |  |  |  |  |  |  | $ 0.66 |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares |  |  |  |  |  |  |  |  | 2,041,814 | 2,041,814 |  |  |  |  |
Proceeds from Warrant Exercises | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to Warrant Exercise Price, Deemed Dividend |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.1 |  |  |  |  |  |  | $ 0.66 |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.1 |  |  |  |  |  |  | $ 0.66 |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.1 |  |  |  |  |  |  | $ 0.66 |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Existing Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  | $ 2.5 |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period |  |  |  |  |  | 90,381 |  |  |  |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  | 90,381 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  | $ 2.57 |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
The 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  |  |  |  | $ 96 |  |  |  |  |
Modification of Warrants |  |  |  |  |  |  |  |  |  | $ 69 |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 2,528,848 |  |  |  | 2,528,848 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 1.3 |  | $ 8.75 |  |  |  | $ 8.75 |
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ (170) |  | $ (47) |  |  |  |  |  |  |  |  |
May 2023 Warrants [Member] | Post-split Amount [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 45.5 |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 2,528,848 |  |  |  | 2,528,848 |  |  | 72,252 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 0.25 |  |  |  | $ 0.25 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 600 |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 200 |  |  |  | $ 200 |  |  |  |
Other Expenses |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] | Post-split Amount [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 8.75 |  |  |  | $ 8.75 |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 2,528,848 |  |  |  | 2,528,848 |  |  | 72,256 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 0.25 |  |  | $ 8.75 | $ 0.25 |  |  | $ 8.75 |
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 5,076,928 |  |  |  |  |  |  |  |  | 145,056 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
The 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,158,566 |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 4.99% |  |
Proceeds from Issuance of Stock and Warrants |  | $ 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds From Issuance of Stock an Warrants |  |  |  |  |  |  |  |  |  | $ 2,900 |  |  |  |  |
The 2024 Public Offering [Member] | Election of the holder prior to the date of issuance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 336,832 |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 477,272 |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-1 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] | 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] | 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] | 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] | 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] | 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 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 477,272 |  |  |  |  |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 700 |  |  |  |  |  |  |  |  |  |
Other Expenses |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |
Proceeds From Debenture and Warrant Issuances, Net |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Warrants |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |
Proceeds from Derivative Instrument, Financing Activities |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |
Proceeds from Convertible Debt |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] | Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |

X
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