Condensed Statements of Operations (Unaudited) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales		$ 4,530,361	$ 4,651,358	$ 12,655,463	$ 13,357,013
Cost of goods sold		3,118,299	3,124,539	8,805,853	8,805,460
GROSS PROFIT		1,412,062	1,526,819	3,849,610	4,551,553
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	[1]	1,347,404	1,368,845	4,068,230	4,026,791
RESEARCH AND DEVELOPMENT EXPENSES	[1]	218,467	179,915	667,774	490,463
(LOSS) INCOME FROM OPERATIONS		(153,809)	(21,941)	(886,394)	34,299
INTEREST EXPENSE		(22,799)	(23,298)	(67,589)	(67,040)
OTHER INCOME		16,225	13,760	49,722	34,986
(LOSS) INCOME BEFORE INCOME TAXES		(160,383)	(31,479)	(904,261)	2,245
INCOME TAX EXPENSE (BENEFIT)		2,361	(6,727)	(170,775)	12,399
NET LOSS		$ (162,744)	$ (24,752)	$ (733,486)	$ (10,154)
LOSS PER COMMON SHARE
Basic (in dollars per share)		$ (0.08)	$ (0.01)	$ (0.37)	$ (0.01)
Diluted (in dollars per share)		$ (0.08)	$ (0.01)	$ (0.37)	$ (0.01)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Weighted average common shares outstanding (in shares)		1,978,926	1,983,553	1,981,568	1,983,553
Diluted (in shares)		1,978,926	1,983,553	1,981,568	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.