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Note 14 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Share-based compensation expense | $ 171,975 | $ 145,769 | $ 305,820 | $ 284,250
Cost of Sales [Member] |  |  |  |
Share-based compensation expense | 4,201 | 5,047 | 8,499 | 11,256
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation expense | 154,250 | 120,113 | 266,101 | 229,455
Research and Development Expense [Member] |  |  |  |
Share-based compensation expense | $ 13,524 | $ 20,609 | $ 31,220 | $ 43,539

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