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Note 14 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Allocated Share-based Compensation Expense, Total $ 584,873 $ 1,116,400
Cost of Sales [Member]    
Allocated Share-based Compensation Expense, Total 21,388 24,151
Selling, General and Administrative Expenses [Member]    
Allocated Share-based Compensation Expense, Total 479,165 998,540
Research and Development Expense [Member]    
Allocated Share-based Compensation Expense, Total $ 84,320 $ 93,709