Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 75,651	$ 70,199	$ 225,274	$ 209,258
Cost of goods sold	29,646	27,626	89,249	81,700
Gross profit	46,005	42,573	136,025	127,558
Operating expenses:
Selling expenses	24,354	23,568	72,964	69,525
General and administrative expenses	20,561	16,616	58,790	54,446
Selling, General and Administrative Expense	44,915	40,184	131,754	123,971
Gain on sale of property	0	0	(5,422)	0
Operating expenses	44,915	40,184	126,332	123,971
Operating income	1,090	2,389	9,693	3,587
Interest expense	(133)	(167)	(393)	(486)
Other income, net	843	66	953	439
Income before income taxes	1,800	2,288	10,253	3,540
Income tax expense	$ 479	$ 463	$ 802	$ 526
Income per share of common stock:
Basic income per share of common stock	$ 0.15	$ 0.21	$ 1.07	$ 0.34
Diluted income per share of common stock	$ 0.14	$ 0.20	$ 1.04	$ 0.34
Weighted average shares outstanding:
Basic weighted average shares outstanding	8,880	8,785	8,856	8,778
Effect of dilutive securities outstanding	253	141	256	139
Diluted weighted average shares outstanding	9,133	8,926	9,112	8,917
Comprehensive income:
Net income	$ 1,321	$ 1,825	$ 9,451	$ 3,014
Adjustment for foreign currency translation	139	(271)	941	764
Net comprehensive income	$ 1,460	$ 1,554	$ 10,392	$ 3,778