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Note 4 - Fair Value Measurements - Significant Unobservable Inputs (Details) - Fair Value, Recurring [Member] | Mar. 31, 2026 | Sep. 30, 2025
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ONCO Series D Preferred Stock [Member] | Measurement Input, Expected Term [Member] |  |
Unobservable input | 1 | 1.5
ONCO Series D Preferred Stock [Member] | Measurement Input, Price Volatility [Member] |  |
Unobservable input | 0.702 | 0.725
ONCO Series D Preferred Stock [Member] | Measurement Input, Discount Rate [Member] |  |
Unobservable input | 0.25 | 0.25
ONCO Series D Preferred Stock [Member] | Calibration Discount Rate [Member] |  |
Unobservable input | 0 | 0.486
ONCO Warrant [Member] | Measurement Input, Expected Term [Member] |  |
Unobservable input | 2.5 | 3
ONCO Warrant [Member] | Calibration Discount Rate [Member] |  |
Unobservable input | 0 | 0.486
ONCO Warrant [Member] | Measurement Input, Option Volatility [Member] |  |
Unobservable input | 0.722 | 0.686

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- Definition Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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