Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues	$ 3,154	$ 2,755	$ 9,320	$ 7,461
Cost of goods sold	1,901	1,697	5,217	4,616
Gross profit	1,253	1,058	4,103	2,845
Operating expenses:
Engineering	123	131	372	427
Sales and marketing	351	360	1,000	886
General and administrative	374	715	1,262	1,563
Total operating expenses	848	1,206	2,634	2,876
Income (loss) from operations	405	(148)	1,469	(31)
Other expenses
Income (loss) before income taxes	405	(148)	1,469	(31)
Provision for income taxes			0	0
Net income (loss)	$ 405	$ (148)	$ 1,469	$ (31)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.20	$ (0.07)	$ 0.72	$ (0.02)
Diluted (in dollars per share)	$ 0.20	$ (0.07)	$ 0.70	$ (0.02)
Shares used in per share calculation:
Basic (in shares)	2,048	2,042	2,048	2,042
Diluted (in shares)	2,065	2,042	2,088	2,042