Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Total revenue	$ 90,277	$ 94,779	$ 253,458	$ 282,219
Cost of goods sold	43,052	44,205	118,999	131,679
Gross profit	47,225	50,574	134,459	150,540
Operating expenses:
Selling expenses	19,155	21,255	55,445	64,864
General and administrative expenses	26,069	22,873	57,806	72,063
Operating expenses	45,224	44,128	113,251	136,927
Operating income	2,001	6,446	21,208	13,613
Interest expense	(142)	(138)	(329)	(481)
Other income (expense), net	(615)	13	(15)	(798)
Income before income taxes	2,474	6,295	20,894	13,930
Income tax expense	736	1,521	6,004	3,703
Net income	$ 1,738	$ 4,774	$ 14,890	$ 10,227
Basic income per share of common stock	$ 0.19	$ 0.53	$ 1.65	$ 1.14
Diluted income per share of common stock	$ 0.19	$ 0.51	$ 1.60	$ 1.09
Weighted average shares outstanding:
Basic weighted average shares outstanding	9,017	8,974	9,017	8,971
Effect of dilutive securities outstanding	313	415	312	399
Diluted weighted average shares outstanding	9,330	9,389	9,329	9,370
Comprehensive income:
Net income	$ 1,738	$ 4,774	$ 14,890	$ 10,227
Adjustment for foreign currency translation	398	(427)	(918)	965
Net comprehensive income	$ 2,136	$ 4,347	$ 13,972	$ 11,192