CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales:
Total net sales	$ 5,953,689	$ 4,589,824	$ 15,300,182	$ 12,770,601
Cost of sales:
Total cost of sales	2,559,016	2,064,617	7,008,691	5,733,385
Gross profit	3,394,673	2,525,207	8,291,491	7,037,216
Operating expenses:
Research and development	870,805	722,525	2,249,439	1,967,379
Selling, general and administrative	1,279,422	1,416,053	4,514,085	4,414,126
Total operating expenses	2,150,227	2,138,578	6,763,524	6,381,505
Operating income	1,244,446	386,629	1,527,967	655,711
Interest income	7,767	99,916	152,358	147,948
Other income	16,261	24,714	44,760	57,314
Income before income taxes	1,268,474	511,259	1,725,085	860,973
Income tax expense (benefit)	8,616	0	(300,786)	7,794
Net income	$ 1,259,858	$ 511,259	$ 2,025,871	$ 853,179
Net income per common share:
Basic (in dollars per share)	$ 0.07	$ 0.03	$ 0.12	$ 0.05
Diluted (in dollars per share)	$ 0.07	$ 0.03	$ 0.12	$ 0.05
Weighted average shares outstanding:
Basic (in shares)	16,952,973	16,880,341	16,931,049	16,860,503
Diluted (in shares)	17,087,275	16,978,643	17,097,414	16,898,321
Product
Net sales:
Total net sales	$ 5,445,748	$ 4,458,446	$ 14,550,124	$ 11,940,865
Cost of sales:
Total cost of sales	2,486,353	2,009,799	6,795,530	5,300,941
Engineering development contracts
Net sales:
Total net sales	507,941	131,378	750,058	829,736
Cost of sales:
Total cost of sales	$ 72,663	$ 54,818	$ 213,161	$ 432,444