CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net sales:
Total net sales	$ 21,595,199	$ 17,572,589	$ 13,850,372
Cost of sales:
Total cost of sales	9,793,224	7,676,119	7,311,923
Gross profit	11,801,975	9,896,470	6,538,449
Operating expenses:
Research and development	2,955,976	2,489,806	3,575,801
Selling, general and administrative	6,100,545	5,877,920	6,674,187
Total operating expenses	9,056,521	8,367,726	10,249,988
Operating income (loss)	2,745,454	1,528,744	(3,711,539)
Interest income	154,950	249,620	53,561
Other income	60,497	73,737	67,724
Income (loss) before income taxes	2,960,901	1,852,101	(3,590,254)
Income tax (benefit) expense	(308,882)	1,805	63,651
Net income (loss)	$ 3,269,783	$ 1,850,296	$ (3,653,905)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.19	$ 0.11	$ (0.22)
Diluted (in dollars per share)	$ 0.19	$ 0.11	$ (0.22)
Weighted average shares outstanding:
Basic (in shares)	16,939,302	16,867,550	16,805,991
Diluted (in shares)	17,114,191	16,942,447	16,805,991
Product
Net sales:
Total net sales	$ 20,806,121	$ 16,165,333	$ 13,450,803
Cost of sales:
Total cost of sales	9,568,553	7,038,717	7,120,731
Engineering development contracts
Net sales:
Total net sales	789,078	1,407,256	399,569
Cost of sales:
Total cost of sales	$ 224,671	$ 637,402	$ 191,192