Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 1,160	$ 920
Cost of goods sold	812	585
Gross profit	348	335
Operating expenses:
General and administrative	584	426
Sales and marketing	87	95
Research and development
Gain on sale or disposal of assets		(75)
Loss from operations	(323)	(111)
Other income:
Interest income	74	168
Realized gain/(loss) on investments	(1,786)
Realized gain/(loss) on foreign currency translation	(14)	3
Unrealized gain/(loss) on equity investments	(156)
Total other income/(loss)	(1,882)	171
Income/ (loss) before taxes	(2,205)	60
Income tax expense	(4)	(4)
Net income/ (loss)	$ (2,209)	$ 56
Net income (loss) per common share
Basic	$ (0.84)	$ 0.02
Diluted	$ (0.84)	$ 0.02
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,629,467	2,730,122
Diluted	2,629,467	2,735,220