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Note 16 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Payment Arrangement, Expense | $ 446 | $ 322 | $ 956 | $ 776
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 10 | 5 | 24 | 16
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 424 | 311 | 904 | 738
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 12 | $ 6 | $ 28 | $ 22

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