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Note 3 - Accounts Receivable (Details Textual) - Customer Concentration Risk [Member] - Accounts Receivable [Member]
9 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Rate
Number of Major Customers 1 2
Customer One [Member]    
Concentration Risk, Percentage 10.00% 13.00%
Customer Two [Member]    
Concentration Risk, Percentage   10.00%