CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Net sales:
Product	$ 25,174,846	$ 23,383,504	$ 31,855,060
Engineering - modification and development	562,806	1,873,819	4,879,090
Total net sales	25,737,652	25,257,323	36,734,150
Cost of sales
Product	11,790,885	10,732,091	16,601,739
Engineering - modification and development	154,299	787,938	1,294,245
Total cost of sales	11,945,184	11,520,029	17,895,984
Gross profit	13,792,468	13,737,294	18,838,166
Operating expenses:
Research and development	5,500,924	5,234,240	5,313,007
Selling, general and administrative	7,683,637	8,099,587	8,647,506
Total operating expenses	13,184,561	13,333,827	13,960,513
Operating income	607,907	403,467	4,877,653
Interest income	143,942	188,171	398,041
Interest (expense)	(1,509)	(2,356)	(82,276)
Other income	150,010	50,000	50,099
Income before income taxes	900,350	639,282	5,243,517
Income tax expense (benefit)	183,760	(109,094)	234,856
Net income	$ 716,590	$ 748,376	$ 5,008,661
Net income per common share:
Basic (in dollars per share)	$ 0.04	$ 0.04	$ 0.30
Diluted (in dollars per share)	$ 0.04	$ 0.04	$ 0.30
Weighted Average Shares Outstanding:
Basic (in shares)	16,782,223	16,751,528	16,745,379
Diluted (in shares)	16,824,621	16,777,886	16,760,500