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Note 14 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Expense | $ 257,566 | $ 148,813 | $ 563,386 | $ 433,063
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 3,627 | 5,111 | 12,126 | 16,367
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 242,660 | 123,311 | 508,761 | 352,766
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 11,279 | $ 20,391 | $ 42,499 | $ 63,930

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