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Note 7 - Commitments (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Apr. 30, 2020 | Dec. 31, 2016
California Subsidiary 401k [Member] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 100.00% |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 17,870 | $ 16,872 |  |
The Constructs [Member] |  |  |  |
Maximum Contingent Obligation |  |  | $ 356,000,000 |
Payments for Milestone, Royalty and Sublicensing | 0 | 0 |  |
The Constructs [Member] | Drug Substance [Member] |  |  |  |
Purchase Obligation |  |  | $ 5,000,000 |
Payments to Suppliers | 0 | 0 |  |
License Agreement Related to Pharmaceutical Products [Member] |  |  |  |
Maximum Contingent Obligation |  |  |  | $ 18,400,000
Finite-Lived License Agreements, Gross |  |  |  | $ 0
Finite-Lived License Agreements, Gross | 0 | 0 |  |
License Agreement to Acquire Global Rights of Pharmaceutical Product [Member] |  |  |  |
Maximum Contingent Obligation | 68,900,000 |  |  |
Milestone Expense | $ 100,000 | $ 50,000 |  |

X
- Definition Amount of maximum contingent obligation. + References No definition available. + Details
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X
- Definition Amount of milestone expense. + References No definition available. + Details
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X
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- Definition Gross carrying amount as of the balance sheet date of certain rights acquired to exercise a certain privilege or pursue a particular business or occupation and which is deemed to have a finite economic life. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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