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Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00%
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 5,479 | $ 5,686
Deferred Tax Assets, Valuation Allowance, Total | 8,313 | $ 7,878
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Deferred Tax Assets, Net, Total | 8,039 |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 35,819 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 1,262 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 2,373 |
State and Local Jurisdiction [Member] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 176 |

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