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Note 5 - Preferred Stock (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2023 | Mar. 31, 2023 | Mar. 31, 2023 | Mar. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 42,000 | 42,000 |  | 42,000 | 42,000 |
Preferred Stock, Shares Designated (in shares) |  |  |  |  | 1,983,250 | 1,983,250 |  |  | 1,983,250 |
Preferred Stock, Shares Issued (in shares) |  |  |  |  | 545 | 545 |  | 1,930 | 545 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ 0.2792 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  | 545 | 545 |  | 1,930 | 545 |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 5,101,345 | 5,101,345 |  |  | 5,101,345 |
Conversion of Series F Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  | 2,111 | 3,033 |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  | 7,955,743 | 11,558,000 |  | 14,102,000 | 25,660,000 |
Preferred Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  | 1,648 | 1,648 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 1,478,000 | $ 0 |  |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  |  | 8.00% |  |  |  |  |
Class of Warrant or Right, Cash Fee |  |  |  |  | $ 129,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 975 | $ 975 |  |  | $ 975 |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  | 3 years | 3 years |  |  | 3 years |
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights |  |  |  |  | 100.00% | 100.00% |  |  | 100.00% |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 31,102 | 31,102 |  |  | 31,102 |
Common Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  |  |  |  | 746,027 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.71 | $ 1.71 |  | $ 1.73 | $ 1.71 | $ 0
Class of Warrant or Right, Issued (in shares) |  |  |  |  | 963,745 | 963,745 |  | 4,543,626 |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 5,101,345 | 5,101,345 |  | 4,137,850 | 5,101,345 | 343,099
Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 6,386,000 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net |  |  | 5,364,000 |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 1,022,000 |  |  |  |  |  |  |
Private Placement [Member] | Preferred Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 32,750 |  |  |  |  |  |
Private Placement [Member] | Investor Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 3,830,417 |  |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 6,550 |  |  |  | 1,648 |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  | $ 1.71 | $ 0.33 | $ 0.33 | $ 1.71 |  | $ 0.33 |
Preferred Stock, Convertible, Conversion Price Percentage |  |  |  | 80.00% |  |  |  |  |  |
Preferred Stock, Stated Value Per Share (in dollars per share) | $ 1,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 9.00% |  |  |  |  | 20.00% |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  | 3,033 |  | 4,620 |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  | 545 | 545 |  | 1,930 | 545 |
Dividends Payable |  |  |  |  | $ 4,000,000 | $ 4,000,000 |  | $ 136,000,000 | $ 4,000,000 |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 1,648 | 1,648 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 1,607,000 | $ 1,607,000 |  |  |  |
Proceeds From Warrant Exercises, Net |  |  |  |  | $ 1,478,000 | $ 1,478,000 |  |  |  |
Series F Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 6,550 |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.0001 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 5,000,000 | 5,000,000 |  |  | 5,000,000 |

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