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Note 11 - Financing Activities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2023 | May 01, 2023 | Sep. 09, 2022 | May 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.82 | $ 7.7 | $ 57.13 |
Proceeds from Warrant Exercises |  |  |  |  | $ 565 | $ 1,703 |  |
Fair Value Adjustment of Warrants |  |  |  |  | $ (272) | $ (5,446) |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  | 2,528,848,000 | (327,860,000) |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  | 7,605,776,000 | 2,431,046,000 |  |
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 |  |  |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  | 300 |  |  | 98 |  |  |
Debt Instrument, Face Amount |  | 3,300 |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | 40 |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  | 300 |  |  | $ 596 |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  | $ 300 |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 2,528,848 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.3 |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 200 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  | $ 100 |  |  |
Fair Value Adjustment of Warrants | $ 200 |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 2,528,848 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.25 |  |  |  | $ 0.25 |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 600 |  |  |
Debt Issuance Costs, Net |  |  |  |  | 200 |  |  |
Other Expenses |  |  |  |  | $ 100 |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 2,528,848 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 0.25 |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 400 |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 5,076,928 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.5 |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 400 |  |  |  |  |  |
The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 1,071,434 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.5 |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 267,860 |  |  |  |  |
Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 77,145 | 137,145 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 | $ 6.3 |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 14,000 | $ 400 |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 60,000 |  |  |  |  |
The 2022 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 327,860 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 | $ 6.3 |  |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 2,100 |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | $ 300 |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  | 327,860 |  |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 500 |  |  |  |  |
Payments of Stock Issuance Costs Allocated to Warrants |  |  | 200 |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 535,716 |  |  |  |  |  | 1,071,434
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | 6.3 |  |  | $ 18.55
Proceeds from Warrant Exercises |  |  | 700 |  |  |  |  |
The September 2022 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 6.3 |  |  |
Proceeds from Warrant Exercises |  |  | $ 1,400 |  |  |  |  |

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