CONDENSED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED STATEMENTS OF OPERATIONS
NET SALES	$ 4,634,177	$ 4,685,361	$ 8,705,655	$ 8,314,353
COST OF GOODS SOLD	2,971,862	3,242,097	5,680,921	5,780,861
GROSS PROFIT	1,662,315	1,443,264	3,024,734	2,533,492
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	1,308,963	1,393,636	2,657,946	2,904,250
RESEARCH AND DEVELOPMENT EXPENSES	156,472	184,704	310,548	350,474
INCOME (LOSS) FROM OPERATIONS	196,880	(135,076)	56,240	(721,232)
INTEREST EXPENSE	(23,807)	(20,826)	(43,742)	(41,643)
OTHER	11,805	5,902	21,226	11,055
INCOME (LOSS) BEFORE INCOME TAXES	184,878	(150,000)	33,724	(751,820)
INCOME TAX EXPENSE (BENEFIT)	39,542	(44,934)	19,126	(267,857)
NET INCOME (LOSS)	$ 145,336	$ (105,066)	$ 14,598	$ (483,963)
INCOME (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.07	$ (0.05)	$ 0.01	$ (0.24)
Diluted (in dollars per share)	$ 0.07	$ (0.05)	$ 0.01	$ (0.24)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	1,983,553	2,018,466	1,983,553	2,018,609
Diluted (in shares)	1,983,553	2,018,466	1,983,553	2,018,609