CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Net sales:
Total net sales	$ 23,044,796	$ 21,595,199	$ 17,572,589
Cost of sales:
Total cost of sales	10,263,166	9,793,224	7,676,119
Gross profit	12,781,630	11,801,975	9,896,470
Operating expenses:
Research and development	2,622,919	2,955,976	2,489,806
Selling, general and administrative	6,257,732	6,100,545	5,877,920
Total operating expenses	8,880,651	9,056,521	8,367,726
Operating income	3,900,979	2,745,454	1,528,744
Interest income	1,234	154,950	249,620
Other income	74,906	60,497	73,737
Income before income taxes	3,977,119	2,960,901	1,852,101
Income tax (benefit) expense	(1,087,783)	(308,882)	1,805
Net income	$ 5,064,902	$ 3,269,783	$ 1,850,296
Net income per common share:
Basic (in dollars per share)	$ 0.29	$ 0.19	$ 0.11
Diluted (in dollars per share)	$ 0.29	$ 0.19	$ 0.11
Weighted average shares outstanding:
Basic (in shares)	17,225,423	16,939,302	16,867,550
Diluted (in shares)	17,226,620	17,114,191	16,942,447
Product
Net sales:
Total net sales	$ 22,760,083	$ 20,806,121	$ 16,165,333
Cost of sales:
Total cost of sales	10,185,510	9,568,553	7,038,717
Engineering development contracts
Net sales:
Total net sales	284,713	789,078	1,407,256
Cost of sales:
Total cost of sales	$ 77,656	$ 224,671	$ 637,402