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Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($) | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Inventory Valuation |  |
Raw materials | $ 4,116,347 | $ 3,729,692
Work-in-process | 670,883 | 629,814
Finished goods | 117,804 | 185,886
Inventories | 4,905,034 | 4,545,392
Prepaid expenses and other current assets |  |
Prepaid insurance | 483,344 | 318,138
Income tax receivable | 15,118 |
Other | 280,388 | 514,938
Total prepaid expenses and other current assets | $ 778,850 | $ 833,076

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