Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 978	$ 1,345	$ 2,818	$ 3,667
Cost of goods sold	885	1,537	2,738	8,276
Gross profit (loss)	93	(192)	80	(4,609)
Operating expenses:
General and administrative	488	812	1,802	3,921
Sales and marketing	73	141	298	579
Research and development	33	50	108	887
(Gain) loss from sale or disposal of assets	(1,124)	(46)	(2,738)	1,135
Long-lived asset impairment charge				675
Income (loss) from operations	623	(1,149)	610	(11,806)
Other income:
Interest income	99	39	237	73
Realized gain (loss) on foreign currency translation	(6)	8	(8)	27
Total other income	93	47	229	100
Income (loss) before income taxes	716	(1,102)	839	(11,706)
Income tax expense	(6)	(7)	(19)	(85)
Net income (loss)	$ 710	$ (1,109)	$ 820	$ (11,791)
Net income (loss) per common share
Basic	$ 0.26	$ (0.41)	$ 0.3	$ (4.37)
Diluted	$ 0.26	$ (0.41)	$ 0.3	$ (4.37)
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,733,597	2,716,994	2,732,722	2,696,008
Diluted	2,739,593	2,716,994	2,736,720	2,696,008