Accrued Expenses (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accrued Expenses
Warranty	$ 1,009,368	$ 878,901	$ 777,599
Salary, benefits and payroll taxes	267,323	537,451
Professional fees	308,905	353,012
Other	304,312	799,167
Total accrued expenses	1,889,908	2,568,531
EDC program costs	$ 100,000	$ 600,000