Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidated Statements of Income
Revenue, net	$ 3,264	$ 3,054	$ 6,148	$ 5,859
Cost of revenue	1,203	1,211	2,351	2,345
Gross profit	2,061	1,843	3,797	3,514
Operating expenses:
Engineering, research and development	157	174	335	315
Selling, general and administrative	1,065	755	2,092	1,667
Total operating expenses	1,222	929	2,427	1,982
Income from operations	839	914	1,370	1,532
Other income (expense)
Other income (expense), net	(2)	15	17	29
Income before income tax expense	837	929	1,387	1,561
Income tax expense	(288)	(180)	(474)	(206)
Net income	549	749	913	1,355
Other comprehensive income, net of tax:
Foreign currency translation adjustments	25	(25)	36	(21)
Comprehensive income	$ 574	$ 724	$ 949	$ 1,334
Earnings per share, basic and diluted	$ 0.07	$ 0.10	$ 0.12	$ 0.18
Weighted average common shares outstanding - basic	7,333	7,326	7,331	7,326
Weighted average common shares outstanding - diluted	7,420	7,406	7,416	7,400