CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net Sales:
Total net sales	$ 4,869,652	$ 4,511,428
Cost of sales:
Total cost of sales	2,303,829	1,909,781
Gross profit	2,565,823	2,601,647
Operating expenses:
Research and development	600,298	666,615
Selling, general and administrative	1,733,154	1,703,274
Total operating expenses	2,333,452	2,369,889
Operating income	232,371	231,758
Interest income	879	78,870
Other income	16,392	17,280
Income before income taxes	249,642	327,908
Income tax expense	9,497	0
Net income	$ 240,145	$ 327,908
Net income per common share:
Basic (in dollars per share)	$ 0.01	$ 0.02
Diluted (in dollars per share)	$ 0.01	$ 0.02
Weighted average shares outstanding:
Basic (in shares)	17,214,384	16,909,036
Diluted (in shares)	17,216,287	17,081,578
Product
Net Sales:
Total net sales	$ 4,802,835	$ 4,458,694
Cost of sales:
Total cost of sales	2,294,294	1,844,480
Engineering development contracts
Net Sales:
Total net sales	66,817	52,734
Cost of sales:
Total cost of sales	$ 9,535	$ 65,301