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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00%
Research and development credit | $ 4,712 | $ 5,479
Deferred Tax Assets, Valuation Allowance | 9,378 | $ 8,313
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Deferred Tax Assets, Net, Total | 7,373 |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 32,817 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 1,262 |
Research and development credit | 2,500 |
State and Local Jurisdiction [Member] |  |
Research and development credit | $ 119 |

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