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Note 19 - Major Customers, Suppliers and Related Information (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Revenue Benchmark [Member]        
Number Of Major Customers 1 2 1 2
Revenue Benchmark [Member] | One Customer [Member]        
Concentration Risk, Percentage 64.00%   63.00%  
Revenue Benchmark [Member] | Customer 1 [Member]        
Concentration Risk, Percentage   56.00%   58.00%
Revenue Benchmark [Member] | Customer 2 [Member]        
Concentration Risk, Percentage   13.00%   10.00%
Accounts Receivable [Member]        
Number Of Major Customers     2 2
Accounts Receivable [Member] | Customer 1 [Member]        
Concentration Risk, Percentage     63.00% 55.00%
Accounts Receivable [Member] | Customer 2 [Member]        
Concentration Risk, Percentage     15.00% 11.00%