Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 769	$ 801	$ 1,689	$ 1,840
Cost of goods sold	729	921	1,314	1,853
Gross loss or profit	40	(120)	375	(13)
Operating expenses:
General and administrative	928	692	1,354	1,314
Sales and marketing	69	106	164	225
Research and development		42		75
(Gain) loss on disposal of assets	(76)	(1,052)	(151)	(1,614)
Asset impairment charge
Income (loss) from operations	(881)	92	(992)	(13)
Other income:
Interest income	93	80	261	138
Unrealized gain (loss) on investments	(105)		(105)
Realized gain on investments	66		66
Realized gain (loss) on foreign currency translation	(3)	(16)		(2)
Total other income	51	64	222	136
Income (loss) before income taxes	(830)	156	(770)	123
Income tax expense	(6)	(6)	(10)	(13)
Net income (loss)	$ (836)	$ 150	$ (780)	$ 110
Net income (loss) per common share
Basic	$ (0.31)	$ 0.05	$ (0.29)	$ 0.04
Diluted	$ (0.31)	$ 0.05	$ (0.29)	$ 0.04
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,704,357	2,733,202	2,717,240	2,732,285
Diluted	2,704,357	2,739,198	2,717,240	2,735,283