Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
NET SALES	$ 83,098,187	$ 82,321,268	$ 82,923,992
COST OF SALES	32,517,996	30,207,439	31,210,750
Gross Profit	50,580,191	52,113,829	51,713,242
OPERATING EXPENSES	46,751,728	44,872,007	41,412,511
INCOME FROM OPERATIONS	3,828,463	7,241,822	10,300,731
OTHER (INCOME) EXPENSE:
Interest expense	304,957	205,555	155,189
Other, net	(180,191)	(126,857)	(57,287)
Total other expense	124,766	78,698	97,902
INCOME BEFORE INCOME TAXES	3,703,697	7,163,124	10,202,829
PROVISION FOR INCOME TAXES	1,739,869	2,711,373	3,800,570
NET INCOME	1,963,828	4,451,751	6,402,259
Foreign currency translation adjustments	(548,557)	931,026	(205,450)
COMPREHENSIVE INCOME	$ 1,415,271	$ 5,382,777	$ 6,196,809
NET INCOME PER COMMON SHARE:
BASIC (in dollars per share)	$ 0.21	$ 0.48	$ 0.69
DILUTED (in dollars per share)	$ 0.21	$ 0.48	$ 0.69
Weighted Average Number of Shares Outstanding:
Basic (in shares)	9,185,203	9,242,092	9,301,867
Diluted (in shares)	9,185,662	9,256,810	9,321,558