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Warranty (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Warranty cost and accrual information    
Warranty accrual, beginning of period $ 878,901 $ 777,599
Accrued expense for fiscal year 409,013 290,910
Warranty cost incurred for fiscal year (278,546) (189,608)
Warranty accrual, end of period $ 1,009,368 $ 878,901