Consolidated Statements of Income and Comprehensive Income (loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total revenue	$ 91,343	$ 84,459
Gross profit	48,923	46,218
Operating expenses:
Selling expenses	21,742	21,940
General and administrative expenses	21,637	22,441
Operating expenses	43,379	44,381
Operating income	5,544	1,837
Interest expense	(197)	(240)
Other expense, net	(472)	(287)
Income before income taxes	5,819	1,884
Income tax expense	$ 1,673	$ 648
Basic income per share of common stock	$ 0.46	$ 0.14
Diluted income per share of common stock	$ 0.44	$ 0.13
Weighted average shares outstanding:
Basic weighted average shares outstanding	8,962	8,888
Effect of dilutive securities outstanding	355	297
Diluted weighted average shares outstanding	9,317	9,185
Comprehensive income (loss):
Net income	$ 4,146	$ 1,236
Adjustment for foreign currency translation	675	(1,483)
Net comprehensive income (loss)	4,821	(247)
Product [Member]
Revenue	81,915	74,970
Gross profit	38,007	34,832
Service [Member]
Revenue	9,428	9,489
Gross profit	$ 4,413	$ 3,409