Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Statements of Income
Revenue, net	$ 2,649	$ 3,246	$ 8,797	$ 9,105
Cost of revenue	992	1,296	3,343	3,641
Gross profit	1,657	1,950	5,454	5,464
Operating expenses:
Engineering, research and development	230	183	565	498
Selling, general and administrative	895	830	2,987	2,497
Total operating expenses	1,125	1,013	3,552	2,995
Income from operations	532	937	1,902	2,469
Other income (expense):
Other income (expense), net	(4)	6	13	35
Income before income tax expense	528	943	1,915	2,504
Income tax expense	176	329	650	535
Net income	352	614	1,265	1,969
Other comprehensive income, net of tax:
Foreign currency translation adjustments	39	(4)	75	(25)
Comprehensive income	$ 391	$ 610	$ 1,340	$ 1,944
Earnings per share, basic and diluted	$ 0.05	$ 0.08	$ 0.17	$ 0.27
Weighted average common shares outstanding - basic	7,336	7,327	7,332	7,327
Weighted average common shares outstanding - diluted	7,425	7,410	7,418	7,406