CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net sales:
Product	$ 5,940,410	$ 4,549,520
Engineering development contracts	643,168	2,174,735
Total net sales	6,583,578	6,724,255
Cost of sales:
Product	2,908,957	2,241,553
Engineering development contracts	358,810	1,720,897
Total cost of sales	3,267,767	3,962,450
Gross profit	3,315,811	2,761,805
Operating expenses:
Research and development	931,600	654,999
Selling, general and administrative	2,692,944	1,940,491
Total operating expenses	3,624,544	2,595,490
Operating (loss) income	(308,733)	166,315
Interest income	7,025	5,885
Other income	32,410	10,822
(Loss) income before income taxes	(269,298)	183,022
Income tax benefit	(53,860)	(410,720)
Net (loss) income	$ (215,438)	$ 593,742
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.01)	$ 0.04
Diluted (in dollars per share)	$ (0.01)	$ 0.03
Weighted average shares outstanding:
Basic (in shares)	16,909,638	16,955,726
Diluted (in shares)	16,909,638	17,040,681