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Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement, Expense | $ 295,290 | $ 171,975 | $ 453,617 | $ 305,820
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 6,909 | 4,201 | 10,551 | 8,499
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 283,314 | 163,932 | 427,241 | 284,973
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 5,067 | $ 3,842 | $ 15,825 | $ 12,348

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