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Accrued Expenses (Details) - USD ($)
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Accrued Expenses      
Warranty $ 547,743 $ 606,680 $ 854,952
Salary, benefits and payroll taxes 483,797 212,322  
Professional fees 151,956 153,298  
Operating lease 45,126 84,892  
Other 133,338 138,618  
Total accrued expenses $ 1,361,960 $ 1,110,918