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Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement, Expense $ 322,025 $ 257,566 $ 775,642 $ 563,388
Cost of Sales [Member]        
Share-based Payment Arrangement, Expense 4,861 3,627 15,412 12,126
Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expense 310,997 242,660 738,238 508,763
Research and Development Expense [Member]        
Share-based Payment Arrangement, Expense $ 6,167 $ 11,279 $ 21,992 $ 42,499