Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 583	$ 978	$ 2,272	$ 2,818
Cost of goods sold	585	885	1,899	2,738
Gross profit/(loss)	(2)	93	373	80
Operating expenses:
General and administrative	585	488	1,939	1,802
Sales and marketing	111	73	275	298
Research and development		33		108
Gain on disposal of assets	(122)	(1,124)	(273)	(2,738)
Income/(loss) from operations	(576)	623	(1,568)	610
Other income:
Interest income	107	99	368	237
Unrealized gain/(loss) on investments	119		14
Realized gain/(loss) on investments	6		72
Realized gain/(loss) on foreign currency translation	(2)	(6)	(2)	(8)
Total other income	230	93	452	229
Income/(loss) before income taxes	(346)	716	(1,116)	839
Income tax expense	(6)	(6)	(16)	(19)
Net income/(loss)	$ (352)	$ 710	$ (1,132)	$ 820
Net income/(loss) per common share
Basic	$ (0.13)	$ 0.26	$ (0.42)	$ 0.3
Diluted	$ (0.13)	$ 0.26	$ (0.42)	$ 0.3
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,691,815	2,733,597	2,708,765	2,732,722
Diluted	2,691,815	2,739,593	2,708,765	2,736,720