Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidated Statements of Income and Comprehensive Income
Revenue, net	$ 2,683	$ 3,264	$ 5,256	$ 6,148
Cost of revenue	1,135	1,203	2,297	2,351
Gross profit	1,548	2,061	2,959	3,797
Operating expenses:
Engineering, research and development	237	157	461	335
Selling, general and administrative	881	1,065	1,849	2,092
Total operating expenses	1,118	1,222	2,310	2,427
Income from operations	430	839	649	1,370
Other income (expense):
Other income (expense), net	62	(2)	16	17
Income before income tax expense	492	837	665	1,387
Income tax expense	133	288	188	474
Net income	359	549	477	913
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(112)	25	(27)	36
Comprehensive income	$ 247	$ 574	$ 450	$ 949
Earnings per share, basic and diluted	$ 0.05	$ 0.07	$ 0.06	$ 0.12
Weighted average common shares outstanding - basic	7,317	7,333	7,322	7,331
Weighted average common shares outstanding - diluted	7,407	7,420	7,410	7,416