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Note 6 - Preferred Stock (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 33 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2023 | Mar. 31, 2023 | Sep. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Sep. 30, 2025 | Jun. 05, 2025 | Mar. 30, 2023
Preferred Stock, Shares Authorized (in shares) |  |  | 5,000,000 |  |  | 5,000,000 |  | 5,000,000 |  | 5,000,000 | 5,000,000 |  |
Preferred Stock, Shares Designated (in shares) |  |  | 1,983,250 |  |  | 1,983,250 |  |  |  |  | 1,983,250 |  |
Preferred Stock, Shares Issued (in shares) |  |  | 150 |  |  | 150 |  | 545 |  | 545 | 150 |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 150 |  |  | 150 |  | 545 |  | 545 | 150 |  |
Preferred Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 975 |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  | 575 |  |  | 575 | 1,648 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 561,000 |  |  | $ 561,000 | $ 1,607,000 |  |  |  |  |  |
Proceeds From Warrant Exercises, Net |  |  | $ 516,000 |  |  | $ 516,000 | 1,478,000 |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 30,527 |  |  | 30,527 |  |  |  |  | 30,527 |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee |  |  | $ 45,000 |  |  | $ 45,000 | $ 129,000 |  |  |  |  |  |
Conversion of Series F Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  | 780 |  |  | 970 | 3,033 |  |  |  |  |  |
Conversion of Stock, Amount of Dividends Converted |  |  | $ 20,000 |  |  | $ 39,000 | $ 194,000 |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  | 212,454 |  |  | 257,617 | 288,968 | 288,947 | 352,624 | 641,571 | 899,188 |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 150 |  |  | 150 |  | 545 | 1,930 | 545 | 150 |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  | $ 3.77 |  |  | $ 3.77 | $ 11.17 | $ 11.17 | $ 13.6 | $ 11.17 | $ 3.77 | $ 3.77 | $ 68.4
Preferred Stock, Convertible, Conversion Price Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Preferred Stock, Convertible, Floor Price (in dollars per share) | $ 11.17 |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  | 970 |  | 3,033 |  |  |  |  |
Dividends Payable |  |  | $ 19,000,000 |  |  | $ 19,000,000 |  | $ 29,000,000 | $ 136,000,000 | $ 29,000,000 | $ 19,000,000 |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 575 |  |  | 575 | 1,648 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  | 5,000,000 |  |  | 5,000,000 |  |  |  |  | 5,000,000 |  |

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