CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Net sales:
Product	$ 6,846,129	$ 5,285,345	$ 11,585,577	$ 9,307,397
Engineering development contracts	1,368,845	1,474,876	3,166,131	2,208,283
Total net sales	8,214,974	6,760,221	14,751,708	11,515,680
Cost of sales:
Product	2,602,547	2,783,129	4,762,996	4,826,395
Engineering development contracts	1,661,033	876,376	2,997,067	1,462,970
Total cost of sales	4,263,580	3,659,505	7,760,063	6,289,365
Gross profit	3,951,394	3,100,716	6,991,645	5,226,315
Operating expenses:
Research and development	805,126	926,379	1,655,978	1,716,602
Selling, general and administrative	1,935,431	1,827,794	3,740,240	3,821,369
Total operating expenses	2,740,557	2,754,173	5,396,218	5,537,971
Operating income (loss)	1,210,837	346,543	1,595,427	(311,656)
Interest income	6,181	20,156	23,753	41,935
Interest (expense)		(180)		(417)
Other income	13,261	8,568	24,806	50,637
Income (loss) before income taxes	1,230,279	375,087	1,643,986	(219,501)
Income tax expense (benefit)	123,151	86,214	219,271	(165,395)
Net income (loss)	$ 1,107,128	$ 288,873	$ 1,424,715	$ (54,106)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.07	$ 0.02	$ 0.09	$ 0.00
Diluted (in dollars per share)	$ 0.07	$ 0.02	$ 0.09	$ 0.00
Cash dividends per share (in dollars per share):			$ 1.50
Weighted Average Shares Outstanding:
Basic (in shares)	16,776,924	16,636,725	16,692,715	16,679,109
Diluted (in shares)	16,781,756	16,636,732	16,695,135	16,679,109