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Note 14 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Share-based Payment Arrangement, Expense | $ 735,003 | $ 584,873
Cost of Sales [Member] |  |
Share-based Payment Arrangement, Expense | 15,792 | 21,388
Selling, General and Administrative Expenses [Member] |  |
Share-based Payment Arrangement, Expense | 665,295 | 479,165
Research and Development Expense [Member] |  |
Share-based Payment Arrangement, Expense | $ 53,916 | $ 84,320

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