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Note 11 - Concentration of Credit Risk and Major Customers and Suppliers (Details Textual) - Customer Concentration Risk [Member]
12 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer Benchmark [Member]  
Number of Major Customers 4
Revenue from Contract with Customer Benchmark [Member] | Customer 1 [Member]  
Concentration Risk, Percentage 21.00%
Revenue from Contract with Customer Benchmark [Member] | Customer 2 [Member]  
Concentration Risk, Percentage 12.00%
Revenue from Contract with Customer Benchmark [Member] | Customer 3 [Member]  
Concentration Risk, Percentage 12.00%
Revenue from Contract with Customer Benchmark [Member] | Customer 4 [Member]  
Concentration Risk, Percentage 10.00%
Accounts Receivable [Member]  
Number of Major Customers 2
Accounts Receivable [Member] | Customer 1 [Member]  
Concentration Risk, Percentage 79.00%
Accounts Receivable [Member] | Customer 2 [Member]  
Concentration Risk, Percentage 11.00%