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v3.26.1

Note 4 - Fair Value Measurements (Details Textual) |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2026 USD ($) shares | Mar. 25, 2026 | Sep. 22, 2025 USD ($) shares | Aug. 08, 2025 | Aug. 05, 2025 | Mar. 31, 2026 USD ($) shares | Mar. 31, 2025 USD ($) shares | Mar. 31, 2026 USD ($) shares | Mar. 31, 2025 USD ($) shares | Sep. 30, 2025 shares
Proceeds from Sale of Equity Securities, FV-NI | $ |  |  |  |  |  |  |  | $ 3,168,910 | $ 393,217 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ |  |  |  |  |  | $ 1,976,872 | $ 0 | $ 1,730,192 | $ 0 |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  | 10 | 10 |  |  |  |  |
Reverse Stock Split [Member] | ONCO [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 5 |  |  |  |  |  |  |  |
Series D Preferred Stock [Member] | ONCO [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 16,099 |  |  | 1,196 |  | 1,196 |  | 3,125
ONCO Warrant [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 169,395 |  |  |  |  |  |  |
ONCO Warrant [Member] | ONCO [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 872,565 |  |  | 169,395 |  | 169,395 |  | 169,395
ONCO Series D Preferred Stock and ONCO Warrant [Member] | ONCO [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Securities, FV-NI | $ |  |  | $ 12,900,000 |  |  |  |  |  |  |
ONCO Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 3,125 |  |  |  |  |  |  |
ONCO Series D Preferred Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  | 1,929 |  |  |  |
ONCO Series D Preferred Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 1,196 |  |  |  |  |  |  |  |  |
ONCO Series D Preferred Stock [Member] | ONCO [Member] | Calibration Discount Rate [Member] |  |  |  |  |  |  |  |  |  |
Unobservable input |  |  |  |  |  | 0 |  | 0 |  |
ONCO Common Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  | 771,091 |  |  |  |
ONCO Common Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) | 1,041,743 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ |  |  |  |  |  |  | $ (300,000) |  |  |
Common Stock [Member] | ONCO [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  |  |  |  | 770,772 | 28,549 | 770,772 | 28,549 |
Proceeds from Sale of Equity Securities, FV-NI | $ |  |  |  |  |  | $ 3,200,000 | $ 400,000 |  |  |
Common Stock [Member] | ONCO [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | 1,042,062 |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Securities, FV-NI | $ | $ 1,800,000 |  |  |  |  |  |  |  |  |

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