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Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expense | $ 158,327 | $ 133,845
Cost of Sales [Member] |  |
Share-based Payment Arrangement, Expense | 3,642 | 4,298
Selling, General and Administrative Expenses [Member] |  |
Share-based Payment Arrangement, Expense | 143,927 | 111,851
Research and Development Expense [Member] |  |
Share-based Payment Arrangement, Expense | $ 10,758 | $ 17,696

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