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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Balance at Beginning of Year $ 289,085 $ 79,085
Additions Charged to Costs and Expenses 210,000
Less Write-offs
Balance at End of Year $ 289,085 $ 289,085