Annual report pursuant to Section 13 and 15(d)

Note 3 - Income Taxes (Details Textual)

v3.20.2
Note 3 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2018
Accrued Income Taxes, Current $ 145,000 $ 845,000  
Deferred Tax Assets, Valuation Allowance, Total 47,014 $ 104,858
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 1,905,000 $ 769,000  
Operating Loss Carryforwards, Valuation Allowance, Total 47,000   $ 105,000
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (58,000)    
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Expired and Utilized [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (68,000)    
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Higher Expected NOL Utilization [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 10,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]      
Tax Credit Carryforward, Amount   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