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Note 9 - Financing Activities (Details Textual) |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 24, 2024 USD ($) shares | Dec. 21, 2023 USD ($) $ / shares | May 01, 2023 USD ($) $ / shares shares | Apr. 27, 2023 | Dec. 31, 2023 USD ($) $ / shares shares | May 31, 2023 USD ($) | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 $ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 1.82 |  | $ 1.6 | $ 7.7 | $ 7.7
Fair Value Adjustment of Warrants |  |  |  |  |  |  | $ (194,000) | $ (0) |
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 |  |  |  |  |  |
Unsecured Convertible Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 525,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments | 3,750,000 |  |  |  |  |  |  |  |
Debt Issuance Costs, Net | $ 130,000 |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | 19,000 |  |  |  |  |  |  |  |
Other Expenses | $ 111,000 |  |  |  |  |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 3,300,000 |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  |  | 2,538,464 |  |  | 1,030,944 |  |
Debt Issuance Costs, Net |  |  | 300,000 |  |  |  | $ 48,000 |  |
Fair Value Adjustment of Warrants |  |  | 40,000 |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | 300,000 |  |  |  | $ 293,000 |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | $ 300,000 |  |  |  |  |  |
Series D Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  | 2,528,848 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  | $ 100,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 1.3 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 200,000 |  |  |  |
Fair Value Adjustment of Warrants |  | $ 200,000 |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  | 2,528,848 |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | $ 200,000 |  |  |  |
Other Expenses |  |  |  |  | $ 100,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.25 |  |  | $ 0.25 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 600,000 |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  |  |  | 2,528,848 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.25 |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 400,000 |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  | 5,076,928 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.5 |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 400,000 |  |  |  |  |  |

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