Annual report pursuant to Section 13 and 15(d)

Note 12 - Income Taxes (Details Textual)

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Note 12 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2021
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 42,695,000   $ 37,018,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 40,367,000 $ 36,033,000 36,033,000
Deferred Tax Assets, Tax Credit Carryforwards, Other 2,616 2,740 2,740
Deferred Tax Assets, Tax Credit Carryforwards, Research 946,243 946,158 946,158
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 483,000 1,626,000  
Expire In 2026 [Member]      
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 21,750,000    
Expire In 2028 [Member]      
Deferred Tax Assets, Tax Credit Carryforwards, Other 20,945,000 15,268,000 15,268,000
Deferred Tax Assets, Tax Credit Carryforwards, Research 626,000 643,000 643,000
Expire In 2023 [Member]      
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 406,000 $ 384,000 $ 384,000