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Note 3 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Accrued Income Taxes, Current | $ 933,000 | $ 845,000 |
Deferred Tax Assets, Valuation Allowance, Total | 0 | 0 | $ 47,014
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total | $ 0 | 0 |
Open Tax Year | 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2019 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | $ 0 | 769,000 |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount | $ 300,033 | 337,000 |
State and Local Jurisdiction [Member] | Alternative Minimum Tax [Member] |  |  |
Tax Credit Carryforward, Amount |  | 32,000 |
State and Local Jurisdiction [Member] | Research and Development and Alternative Minimum Tax Credit Carryforwards [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | $ 0 |

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