CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Net sales:
Product	$ 13,450,803	$ 16,133,371	$ 26,985,899
Engineering development contracts	399,569	653,303	983,804
Total net sales	13,850,372	16,786,674	27,969,703
Cost of sales:
Product	7,120,731	8,294,228	11,112,339
Engineering development contracts	191,192	374,121	369,984
Total cost of sales	7,311,923	8,668,348	11,482,323
Gross profit	6,538,449	8,118,326	16,487,380
Operating expenses:
Research and development	3,575,801	4,456,657	4,873,328
Selling, general and administrative	6,674,187	3,739,234	9,170,865
Total operating expenses	10,249,988	8,195,891	14,044,193
Operating (loss) income	(3,711,539)	(77,565)	2,443,187
Interest income	53,561	35,888	33,504
Other income	67,724	4,858,224	78,440
(Loss) income before income taxes	(3,590,254)	4,816,547	2,555,131
Income tax expense	63,651	247,920	568,330
Net (loss) income	$ (3,653,905)	$ 4,568,627	$ 1,986,801
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.22)	$ 0.27	$ 0.12
Diluted (in dollars per share)	$ (0.22)	$ 0.27	$ 0.12
Weighted average shares outstanding:
Basic (in shares)	16,805,991	16,742,461	16,927,055
Diluted (in shares)	16,805,991	16,855,644	17,039,296