Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Inventory valuation
Raw materials	$ 3,252,289	$ 2,892,366
Work-in-process	816,081	817,051
Finished goods	376,814	570,691
Inventories	4,445,184	4,280,108
Prepaid expenses and other current assets
Prepaid insurance	249,012	258,015
Other	327,830	286,219
Total prepaid expenses and other current assets	$ 576,842	$ 544,234

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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