Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net revenues	$ 12,229	$ 10,641
Cost of goods sold	7,184	6,392
Gross profit	5,045	4,249
Operating expenses:
Engineering	502	535
Sales and marketing	1,337	1,239
General and administrative	1,716	1,818
Total operating expenses	3,555	3,592
Income from operations	1,490	657
Other income
Income before income taxes	1,490	657
Provision for income taxes	4	17
Net income	1,486	640
Comprehensive income	$ 1,486	$ 640
Net income per share:
Basic (in dollars per share)	$ 0.73	$ 0.31
Diluted (in dollars per share)	$ 0.72	$ 0.31
Shares used to compute net income per share:
Basic (in shares)	2,030	2,042
Diluted (in shares)	2,057	2,042