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Note 18 - Subsequent Events (Details Textual) |  |  |  |  | 3 Months Ended | 9 Months Ended | 10 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 21, 2025 shares | Oct. 16, 2025 USD ($) $ / shares shares | Oct. 09, 2025 USD ($) shares | Aug. 19, 2025 shares | Sep. 30, 2024 USD ($) $ / shares | Jun. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares | Oct. 21, 2025 shares | Oct. 15, 2025 $ / shares | Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 $ / shares | Mar. 31, 2017 shares
Preferred Stock, Convertible, Shares Issuable |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value | $ |  |  |  |  | $ 21,000 | $ 130,000 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 56.63 |  | $ 66.61 | $ 56.63 |  |  | $ 1.41 | $ 50.96 |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  | 481,000 |  |  |  | 0 |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  |  |  |  | $ 3,786,000 | $ 0 |  |  |  |  |
Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  | 481,250 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 481,250 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable |  |  |  | 77,000,000 |  |  |  |  |  |  |  |  |
Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 268,750 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable |  |  |  | 43,000,000 |  |  |  |  |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 1,986,565 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | October 2025 Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares (in shares) |  | 5,405,406 |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value | $ |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 1.1 |  |  |  |  |  |  |  | $ 0.01 |  |  |
Percent of Closing Price |  | 110.00% |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | 2025 Preferred Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable |  |  | 43,000,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | 2025 Preferred Stock Purchase Agreement [Member] | Conversion of Series E Preferred Stock Into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 43,000,000 |  |  |  |
Subsequent Event [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 160 |  |  |  |  |  |  |  | 160 |  |  |  |
Subsequent Event [Member] | Series D Preferred Stock [Member] | Conversion of Series D Preferred Stock Into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 481,250 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 77,000,000 |  |  |  |
Subsequent Event [Member] | Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 441,326 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 268,750 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 2,150,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 268,750 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 268,750 | 268,750 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 160 |  | 160 |  |  |  |  |  | 160 |  |  |  |
Subsequent Event [Member] | Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] | Conversion of Series E Preferred Stock Into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 268,750 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares (in shares) |  | 639,933 |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value | $ |  | $ 175,000 |  |  |  |  |  |  |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 66,243
The 2017 Omnibus Incentive Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  | 1,021,332 |  |  |  |  |  |  |  |  |  |  |

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