Condensed Statement of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 9,000,060	$ 8,582,076	$ 24,859,173	$ 20,556,157
Cost of goods sold	5,726,970	5,515,753	15,572,098	13,561,520
Gross profit	3,273,090	3,066,323	9,287,075	6,994,637
Operating expenses:
Selling	2,032,486	1,812,921	6,209,842	5,341,239
General and administrative	438,326	383,475	1,059,613	1,153,753
Research and development	420,475	457,309	1,199,067	1,367,718
Total	2,891,287	2,653,705	8,468,522	7,862,710
Operating income (loss)	381,803	412,618	818,553	(868,073)
Other income (expense):
Interest income	39	22	230	59
Interest expense	(33,051)	(30,636)	(44,763)	(87,178)
Other, net	(320)	65	(385)	(11,072)
Total other income (expense)	(33,332)	(30,549)	(44,918)	(98,191)
Income (loss) before income taxes	348,471	382,069	773,635	(966,264)
Income taxes	2,537	4,984	21,493	14,123
Net income (loss)	$ 345,934	$ 377,085	$ 752,142	$ (980,387)
Net income (loss) per share:
Basic	$ 0.02	$ 0.03	$ 0.05	$ (0.07)
Diluted	$ 0.02	$ 0.02	$ 0.05	$ (0.07)
Basic weighted average common and common equivalent shares	16,050,540	14,953,285	15,905,348	14,851,229
Diluted weighted average common and common equivalent shares	16,775,498	16,419,374	16,630,306	14,851,229