Annual report pursuant to Section 13 and 15(d)

Note 3 - Income Taxes (Details Textual)

v3.21.2
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