Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total revenue	$ 72,146	$ 96,097	$ 163,181	$ 187,440
Gross profit	38,313	51,043	87,234	99,966
Operating expenses:
Selling expenses	16,306	21,867	36,290	43,609
General and administrative expenses	21,438	27,553	31,737	49,190
Operating expenses	37,744	49,420	68,027	92,799
Operating income	569	1,623	19,207	7,167
Interest expense	(72)	(146)	(187)	(343)
Other income (expense), net	(511)	(339)	600	(811)
Income before income taxes	1,008	1,816	18,420	7,635
Income tax expense	389	509	5,268	2,182
Net income	$ 619	$ 1,307	$ 13,152	$ 5,453
Basic income per share of common stock	$ 0.07	$ 0.15	$ 1.46	$ 0.61
Diluted income per share of common stock	$ 0.07	$ 0.14	$ 1.41	$ 0.58
Weighted average shares outstanding:
Basic weighted average shares outstanding	9,002	8,976	9,017	8,969
Effect of dilutive securities outstanding	296	405	310	379
Diluted weighted average shares outstanding	9,298	9,381	9,327	9,348
Comprehensive income:
Net income	$ 619	$ 1,307	$ 13,152	$ 5,453
Adjustment for foreign currency translation	1,178	717	(1,316)	1,392
Net comprehensive income	1,797	2,024	11,836	6,845
Product [Member]
Revenue	64,571	85,996	145,906	167,911
Cost of goods sold	31,063	40,580	68,868	78,587
Service [Member]
Revenue	7,575	10,101	17,275	19,529
Cost of goods sold	$ 2,770	$ 4,474	$ 7,079	$ 8,887