Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 920	$ 1,039
Cost of goods sold	585	932
Gross profit	335	107
Operating expenses:
General and administrative	426	622
Sales and marketing	95	119
Research and development		33
Gain on sale or disposal of assets	(75)	(562)
Loss from operations	(111)	(105)
Other income:
Interest income	168	58
Realized gain on foreign currency translation	3	14
Total other income	171	72
Income (loss) before income taxes	60	(33)
Income tax expense	(4)	(7)
Net income (loss)	$ 56	$ (40)
Net income (loss) per common share
Basic	$ 0.02	$ (0.01)
Diluted	$ 0.02	$ (0.01)
Weighted average common shares outstanding used in computing net loss per common share
Basic	2,730,122	2,731,368
Diluted	2,735,220	2,731,368