Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 1,118	$ 583	$ 3,568	$ 2,272
Cost of goods sold	826	585	2,577	1,899
Gross profit (loss)	292	(2)	991	373
Operating expenses:
General and administrative	541	585	1,670	1,939
Sales and marketing	87	111	243	275
Gain on sale or disposal of assets		(122)	(1,823)	(273)
Income (loss) from operations	(336)	(576)	901	(1,568)
Other income (loss):
Interest income	3	107	109	368
Unrealized gain on investments		119		14
Realized gain (loss) on investments		6	(1,824)	72
Realized gain (loss) on foreign currency translation	140	(2)	132	(2)
Total other income (loss)	143	230	(1,583)	452
Loss before income taxes	(193)	(346)	(682)	(1,116)
Income tax expense	3	6	12	16
Net loss	$ (196)	$ (352)	$ (694)	$ (1,132)
Net loss per common share
Basic	$ (0.08)	$ (0.13)	$ (0.27)	$ (0.42)
Diluted	$ (0.08)	$ (0.13)	$ (0.27)	$ (0.42)
Weighted average common shares outstanding used in computing net loss per common share
Basic	2,439,309	2,691,815	2,527,574	2,708,765
Diluted	2,439,309	2,691,815	2,527,574	2,708,765