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Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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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

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