CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Sales:
Total net sales	$ 3,977,650	$ 3,087,984
Cost of sales:
Total cost of sales	1,811,847	1,593,268
Gross profit	2,165,803	1,494,716
Operating expenses:
Research and development	596,372	923,721
Selling, general and administrative	1,473,416	1,622,555
Total operating expenses	2,069,788	2,546,276
Operating income (loss)	96,015	(1,051,560)
Interest income	21,552	9,624
Other income	21,854	21,431
Income (loss) before income taxes	139,421	(1,020,505)
Income tax expense (benefit)	0	(138,886)
Net income (loss)	$ 139,421	$ (881,619)
Net income(loss) per common share:
Basic (in dollars per share)	$ 0.01	$ (0.05)
Diluted (in dollars per share)	$ 0.01	$ (0.05)
Weighted average shares outstanding:
Basic (in shares)	16,840,599	16,783,129
Diluted (in shares)	16,840,599	16,783,129
Product
Sales:
Total net sales	$ 3,775,509	$ 3,087,984
Cost of sales:
Total cost of sales	1,723,281	$ 1,593,268
Engineering development contracts
Sales:
Total net sales	202,141
Cost of sales:
Total cost of sales	$ 88,566