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Note 9 - Financing Activities (Details Textual) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) $ / shares shares | Mar. 24, 2024 USD ($) shares | May 01, 2023 USD ($) $ / shares shares | Apr. 27, 2023 | Jun. 30, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | May 31, 2023 USD ($) | Jun. 30, 2024 USD ($) $ / shares shares | Mar. 31, 2024 $ / shares shares | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Dec. 31, 2022 $ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 37.4 |  |  |  | $ 37.4 | $ 50.96 |  | $ 37.4 |  | $ 76.23 | $ 37.4 | $ 76.23 | $ 269.54
Class of Warrant or Right, Exercised During Period (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 90,381,000 | (0) |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  |  |  | $ 226,000 | $ 0 |
Modification of Warrants |  |  |  |  |  |  |  |  |  |  | 69,000 | 285,000 |
Fair Value Adjustment of Warrants |  |  |  |  |  |  |  | $ 80,000 |  | $ (216,000) | (114,000) | $ (216,000) |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |
Other Expenses |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Proceeds From Debenture and Warrant Issuances, Net |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Warrants |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Derivative Instrument, Financing Activities |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |
Proceeds from Convertible Debt |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |
The 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net | $ 96,000 |  |  |  | $ 96,000 |  |  | 96,000 |  |  | 96,000 |  |
Unsecured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ 130,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 525,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  | 107,146 |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  | $ 19,000 |  |  |  |  |  |  |  |  |  |  |
Other Expenses | 15,000 | $ 111,000 |  |  |  |  |  | 14,000 |  |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net | 15,000 |  | 300,000 |  | 15,000 |  |  | 15,000 |  |  | 15,000 |  |
Debt Instrument, Face Amount |  |  | 3,300,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  |  | 72,528 |  |  |  |  | 16,376 |  |  |  |
Fair Value Adjustment of Warrants |  |  | 40,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | $ 92,000 |  | 300,000 |  | $ 92,000 |  |  | $ 92,000 |  |  | $ 92,000 |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
The 2024 Warrant Reprice Existing Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.5 |  |  |  | $ 2.5 |  |  | $ 2.5 |  |  | $ 2.5 |  |
Class of Warrant or Right, Exercised During Period (in shares) | shares |  |  |  |  | 90,381 |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.57 |  |  |  | $ 2.57 |  |  | $ 2.57 |  |  | $ 2.57 |  |
Warrants and Rights Outstanding, Term | 5 years 6 months |  |  |  | 5 years 6 months |  |  | 5 years 6 months |  |  | 5 years 6 months |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 90,381 |  |  |  | 90,381 |  |  | 90,381 |  |  | 90,381 |  |
The 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Modification of Warrants |  |  |  |  |  |  |  | $ (69) |  |  | $ (69) |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 4.9 |  |  |  | $ 4.9 |  |  | $ 4.9 | $ 4.9 |  | $ 4.9 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  | 28,572 |  |  |  |  |  |  | 28,572 |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | 8.75 |  |  |  | $ 8.75 | $ 45.5 |  | 8.75 |  |  | 8.75 |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  | 72,256 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  | $ (47,000) | $ (170,000) |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  | $ 8.75 |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  | 72,256 |  |  |  |  |  |  |
Other Expenses |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 8.75 |  |  |  | $ 8.75 | $ 8.75 |  | $ 8.75 |  |  | $ 8.75 |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  | 72,256 |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 52.5 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  | 145,056 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |

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