Condensed Statements of Operations (Unaudited) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales		$ 4,596,411	$ 4,634,177	$ 8,125,102	$ 8,705,655
Cost of goods sold		3,167,982	2,971,862	5,687,554	5,680,921
GROSS PROFIT		1,428,429	1,662,315	2,437,548	3,024,734
Selling general and administrative*	[1]	1,338,861	1,308,963	2,720,826	2,657,946
Research and development*	[1]	270,465	156,472	449,307	310,548
(LOSS) INCOME FROM OPERATIONS		(180,897)	196,880	(732,585)	56,240
INTEREST EXPENSE		(22,515)	(23,807)	(44,790)	(43,742)
OTHER		17,303	11,805	33,497	21,226
(LOSS) INCOME BEFORE INCOME TAXES		(186,109)	184,878	(743,878)	33,724
INCOME TAX (BENEFIT) EXPENSE		(70,398)	39,542	(173,136)	19,126
NET (LOSS) INCOME		$ (115,711)	$ 145,336	$ (570,742)	$ 14,598
(LOSS) INCOME PER COMMON SHARE
Basic (in dollars per share)		$ (0.06)	$ 0.07	$ (0.29)	$ 0.01
Diluted (in dollars per share)		$ (0.06)	$ 0.07	$ (0.29)	$ 0.01
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Weighted average common shares outstanding (in shares)		1,982,275	1,983,553	1,982,910	1,983,553
Diluted (in shares)		1,982,275	1,983,553	1,982,910	1,983,553

[1] The Company does not allocate all selling, general and administrative expenses or any research and development expenses to its operating segments for internal reporting.