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Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($)
Mar. 31, 2020
Sep. 30, 2019
Inventory valuation    
Raw materials $ 3,715,412 $ 3,408,742
Work-in-process 831,518 775,770
Finished goods 274,132 286,182
Inventories 4,821,062 4,470,694
Prepaid expenses and other current assets    
Prepaid insurance 466,355 302,376
Income tax receivable 310,135  
Other 281,307 339,673
Total prepaid expenses and other current assets $ 1,057,797 $ 642,049