Summary of Significant Accounting Policies - Inventories and Prepaid expenses and other current assets (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Inventory Valuation
Raw materials	$ 5,162,177	$ 4,451,045
Work-in-process	966,888	795,723
Finished goods	10,648	102,336
Total inventories	6,139,713	5,349,104
Prepaid expenses and other current assets
Prepaid insurance	623,186	777,311
Other	449,826	365,159
Total prepaid expenses and other current assets	$ 1,073,012	$ 1,142,470