Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NET SALES	$ 82,321,268	$ 82,923,992	$ 84,161,200
COST OF SALES	30,207,439	31,210,750	32,090,140
Gross Profit	52,113,829	51,713,242	52,071,060
OPERATING EXPENSES	44,872,007	41,412,511	41,596,360
INCOME FROM OPERATIONS	7,241,822	10,300,731	10,474,700
OTHER (INCOME) EXPENSE:
Interest expense	205,555	155,189	330,004
Other, net	(126,857)	(57,287)	(74,357)
Total other expense	78,698	97,902	255,647
INCOME BEFORE INCOME TAXES	7,163,124	10,202,829	10,219,053
PROVISION FOR INCOME TAXES	2,711,373	3,800,570	3,816,648
NET INCOME	4,451,751	6,402,259	6,402,405
Foreign currency translation adjustments	931,026	(205,450)	(999,621)
COMPREHENSIVE INCOME	$ 5,382,777	$ 6,196,809	$ 5,402,784
NET INCOME PER COMMON SHARE:
BASIC (in dollars per share)	$ 0.48	$ 0.69	$ 0.64
DILUTED (in dollars per share)	$ 0.48	$ 0.69	$ 0.63
Weighted Average Number of Shares Outstanding:
Basic (in shares)	9,242,092	9,301,867	10,077,506
Diluted (in shares)	9,256,810	9,321,558	10,102,760