CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Sales:
Total net sales	$ 4,203,127	$ 3,727,204	$ 8,180,777	$ 6,815,188
Cost of sales:
Total cost of sales	1,856,921	2,082,347	3,668,768	3,675,616
Gross profit	2,346,206	1,644,857	4,512,009	3,139,572
Operating expenses:
Research and development	648,482	1,031,622	1,244,854	1,955,343
Selling, general and administrative	1,524,657	1,756,746	2,998,073	3,379,301
Total operating expenses	2,173,139	2,788,368	4,242,927	5,334,644
Operating income (loss)	173,067	(1,143,511)	269,082	(2,195,072)
Interest income	26,480	11,681	48,032	21,305
Other income	10,746	15,664	32,600	37,096
Income (loss) before income taxes	210,293	(1,116,166)	349,714	(2,136,671)
Income tax expense	7,794	200,705	7,794	61,819
Net income (loss)	$ 202,499	$ (1,316,871)	$ 341,920	$ (2,198,490)
Net income(loss) per common share:
Basic (in dollars per share)	$ 0.01	$ (0.08)	$ 0.02	$ (0.13)
Diluted (in dollars per share)	$ 0.01	$ (0.08)	$ 0.02	$ (0.13)
Weighted average shares outstanding:
Basic (in shares)	16,860,568	16,800,244	16,850,584	16,791,687
Diluted (in shares)	16,875,720	16,800,244	16,858,160	16,791,687
Product
Sales:
Total net sales	$ 3,706,910	$ 3,685,702	$ 7,482,419	$ 6,773,686
Cost of sales:
Total cost of sales	1,567,861	2,072,124	3,291,142	3,665,393
Engineering development contracts
Sales:
Total net sales	496,217	41,502	698,358	41,502
Cost of sales:
Total cost of sales	$ 289,060	$ 10,223	$ 377,626	$ 10,223