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Warranty (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Warranty cost and accrual information    
Warranty accrual, beginning of period $ 1,009,368  
Accrued expense for fiscal year 219,390 $ 409,013
Warranty cost incurred for fiscal year (215,297) (278,546)
Warranty accrual, end of period $ 1,013,461 $ 1,009,368