Quarterly Financial Data (unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Quarterly Financial Data (unaudited)
Net sales	$ 4,801,988	$ 4,589,824	$ 4,203,127	$ 3,977,650	$ 3,645,521	$ 3,389,663	$ 3,727,204	$ 3,087,984	$ 17,572,589	$ 13,850,372	$ 16,786,674
Cost of sales	1,942,734	2,064,617	1,856,921	1,811,847	1,829,328	1,806,980	2,082,347	1,593,268	7,676,119	7,311,923	8,668,348
Gross profit	2,859,254	2,525,207	2,346,206	2,165,803	1,816,193	1,582,683	1,644,857	1,494,716	9,896,470	6,538,449	8,118,326
Operating (loss) income	873,033	386,629	173,067	96,015	(444,240)	(1,072,228)	(1,143,511)	(1,051,560)	1,528,744	(3,711,539)	(77,565)
Net (loss) income	$ 997,117	$ 511,259	$ 202,499	$ 139,421	$ (414,378)	$ (1,041,037)	$ (1,316,871)	$ (881,619)	$ 1,850,296	$ (3,653,905)	$ 4,568,627
Net (loss) income per common share
Basic (in dollars per share)	$ 0.06	$ 0.03	$ 0.01	$ 0.01	$ (0.03)	$ (0.06)	$ (0.08)	$ (0.05)	$ 0.11	$ (0.22)	$ 0.27
Diluted (in dollars per share)	$ 0.06	$ 0.03	$ 0.01	$ 0.01	$ (0.03)	$ (0.06)	$ (0.08)	$ (0.05)	$ 0.11	$ (0.22)	$ 0.27