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Note 8 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Deferred Tax Assets, Tax Credit Carryforwards $ 1,662,400 $ 0  
Deferred Income Tax Liabilities, Net 2,008,458 3,165,454  
Deferred Income Tax Assets, Net $ 1,163,594 $ 1,057,079  
Income Tax Examination, Year under Examination 2018 2019    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]      
Actual Tax Credit Recognized in Income Tax Returns     $ 659,920
Effective Income Tax Rate Reconciliation, Tax Credit, Amortization, Period (Year)   20 years  
Tax Credit Carryforward, Annual Amortization Amount $ 129,600 $ 165,652  
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 990,219    
Open Tax Year 2017 2018 2019    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Federal Energy Investment Tax Credit [Member]      
Effective Income Tax Rate Reconciliation, Tax Credit, Amortization, Period (Year) 20 years    
Tax Credit Carryforward, Annual Amortization Amount $ 74,265    
Tax Credit Carryforward, Amount 1,892,164    
Deferred Tax Assets, Tax Credit Carryforwards 655,862    
State and Local Jurisdiction [Member] | Virginia, Jurisdiction [Member]      
Actual Tax Credit Recognized in Income Tax Returns   $ 58,065  
Effective Income Tax Rate Reconciliation, Tax Credit, Amortization, Period (Year)   20 years  
Tax Credit Carryforward, Annual Amortization Amount $ 2,020 $ 5,212 $ 0
Open Tax Year 2018 2019 2020 2021 2022 2023