Quarterly Financial Data (unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Data (unaudited)
Net sales	$ 6,220,551	$ 6,504,592	$ 8,660,982	$ 6,583,578	$ 3,137,089	$ 4,919,690	$ 5,286,050	$ 6,724,255	$ 27,969,703	$ 20,067,084	$ 44,095,023
Cost of sales	2,835,905	2,621,016	2,757,635	3,267,767	2,482,200	2,988,045	3,702,654	3,962,450	11,482,323	13,135,349	30,508,823
Gross profit	3,384,646	3,883,576	5,903,347	3,315,811	654,889	1,931,645	1,583,396	2,761,805	16,487,380	6,931,735	13,586,200
Operating (loss) income	546,460	232,344	1,973,116	(308,733)	(2,884,231)	(264,862)	(637,965)	166,315	2,443,187	(3,620,743)	(142,868)
Net income (loss)	$ 397,129	$ 226,797	$ 1,578,313	$ (215,438)	$ (2,563,812)	$ (3,531,973)	$ (364,091)	$ 593,742	$ 1,986,801	$ (5,866,134)	$ 200,268
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.02	$ 0.01	$ 0.09	$ (0.01)	$ (0.15)	$ (0.21)	$ (0.02)	$ 0.04	$ 0.12	$ (0.35)	$ 0.01
Diluted (in dollars per share)	$ 0.02	$ 0.01	$ 0.09	$ (0.01)	$ (0.15)	$ (0.21)	$ (0.02)	$ 0.03	$ 0.12	$ (0.35)	$ 0.01