CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Net sales:
Total net sales	$ 17,572,589	$ 13,850,372	$ 16,786,674
Cost of sales:
Total cost of sales	7,676,119	7,311,923	8,668,348
Gross profit	9,896,470	6,538,449	8,118,326
Operating expenses:
Research and development	2,489,806	3,575,801	4,456,657
Selling, general and administrative	5,877,920	6,674,187	3,739,234
Total operating expenses	8,367,726	10,249,988	8,195,891
Operating income (loss)	1,528,744	(3,711,539)	(77,565)
Interest income	249,620	53,561	35,888
Other income	73,737	67,724	4,858,224
Income (loss) before income taxes	1,852,101	(3,590,254)	4,816,547
Income tax expense	1,805	63,651	247,920
Net income (loss)	$ 1,850,296	$ (3,653,905)	$ 4,568,627
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.11	$ (0.22)	$ 0.27
Diluted (in dollars per share)	$ 0.11	$ (0.22)	$ 0.27
Weighted average shares outstanding:
Basic (in shares)	16,867,550	16,805,991	16,742,461
Diluted (in shares)	16,942,447	16,805,991	16,855,644
Product
Net sales:
Total net sales	$ 16,165,333	$ 13,450,803	$ 16,133,371
Cost of sales:
Total cost of sales	7,038,717	7,120,731	8,294,228
Engineering development contracts
Net sales:
Total net sales	1,407,256	399,569	653,303
Cost of sales:
Total cost of sales	$ 637,402	$ 191,192	$ 374,121