Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements of Income and Comprehensive Income
Revenue, net	$ 1,920	$ 2,649	$ 7,176	$ 8,797
Cost of revenue	872	992	3,169	3,343
Gross profit	1,048	1,657	4,007	5,454
Operating expenses:
Engineering, research and development	222	230	683	565
Selling, general and administrative	723	895	2,572	2,987
Total operating expenses	945	1,125	3,255	3,552
Income from operations	103	532	752	1,902
Other income (expense):
Other income (expense), net	50	(4)	66	13
Income before income tax expense	153	528	818	1,915
Income tax expense	54	176	242	650
Net income	99	352	576	1,265
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(84)	39	(111)	75
Comprehensive income	$ 15	$ 391	$ 465	$ 1,340
Earnings per share, basic and diluted	$ 0.02	$ 0.05	$ 0.08	$ 0.17
Weighted average common shares outstanding - basic	6,482	7,336	7,039	7,332
Weighted average common shares outstanding - diluted	6,579	7,425	7,129	7,418