CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Net sales:
Product	$ 14,573,475	$ 29,975,410	$ 23,459,034
Engineering development contracts	5,493,609	14,119,613	8,108,273
Total net sales	20,067,084	44,095,023	31,567,307
Cost of sales:
Product	8,417,571	15,050,608	10,601,057
Engineering development contracts	4,717,778	15,458,215	8,341,680
Total cost of sales	13,135,349	30,508,823	18,942,737
Gross profit	6,931,735	13,586,200	12,624,570
Operating expenses:
Research and development	2,705,208	2,618,054	2,578,034
Selling, general and administrative	7,847,270	11,111,014	8,119,071
Total operating expenses	10,552,478	13,729,068	10,697,105
Operating income (loss)	(3,620,743)	(142,868)	1,927,465
Interest income	24,804	21,756	41,174
Other income	33,283	37,758	38,120
Income (loss) before income taxes	(3,562,656)	(83,354)	2,006,759
Income tax (benefit) expense	2,303,478	(283,622)	119,842
Net (loss) income	$ (5,866,134)	$ 200,268	$ 1,886,917
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.35)	$ 0.01	$ 0.11
Diluted (in dollars per share)	$ (0.35)	$ 0.01	0.11
Cash dividend per share (in dollars per share)			$ 1.50
Weighted average shares outstanding:
Basic (in shares)	16,924,189	16,927,879	16,753,068
Diluted (in shares)	16,924,189	17,149,106	16,855,854