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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Changes in the Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Beginning balance $ 155,164 $ 371,271
Provision for credit losses 110,676 54,211
Recoveries of accounts written off 173,660 181,676
Accounts written off (286,153) (451,994)
Ending balance $ 153,347 $ 155,164