CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Net sales:
Product	$ 4,549,520	$ 7,738,614
Engineering development contracts	2,174,735	3,367,197
Total net sales	6,724,255	11,105,811
Cost of sales:
Product	2,241,553	3,798,857
Engineering development contracts	1,720,897	3,526,518
Total cost of sales	3,962,450	7,325,375
Gross profit	2,761,805	3,780,436
Operating expenses:
Research and development	654,999	626,921
Selling, general and administrative	1,940,491	1,744,891
Total operating expenses	2,595,490	2,371,812
Operating income	166,315	1,408,624
Interest income	5,885	10,467
Other income	10,822	5,666
Income before income taxes	183,022	1,424,757
Income tax expense (benefit)	(410,720)	416,161
Net income	$ 593,742	$ 1,008,596
Net income per common share
Basic (in dollars per share)	$ 0.04	$ 0.06
Diluted (in dollars per share)	$ 0.03	$ 0.06
Weighted average shares outstanding:
Basic (in shares)	16,955,726	16,888,086
Diluted (in shares)	17,040,681	17,094,346