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Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($) | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Inventory Valuation |  |
Raw materials | $ 4,013,201 | $ 3,378,246
Work-in-process | 581,568 | 656,382
Finished goods | 244,042 | 256,707
Inventories | 4,838,811 | 4,291,335
Prepaid expenses and other current assets |  |
Prepaid insurance | 287,293 | 336,331
Other | 410,036 | 338,778
Total prepaid expenses and other current assets | $ 697,329 | $ 675,109

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