Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 1,290	$ 769	$ 2,450	$ 1,689
Cost of goods sold	939	729	1,751	1,314
Gross profit	351	40	699	375
Operating expenses:
General and administrative	545	928	1,129	1,354
Sales and marketing	70	69	156	164
Gain on sale or disposal of assets	(1,823)	(76)	(1,823)	(151)
Income (loss) from operations	1,559	(881)	1,237	(992)
Other income:
Interest income	32	93	106	261
Unrealized gain (loss) on investments	156	(105)		(105)
Realized gain (loss) on investments	(37)	66	(1,824)	66
Realized gain (loss) on foreign currency translation	5	(3)	(8)
Total other income (loss)	156	51	(1,726)	222
Income (loss) before income taxes	1,715	(830)	(489)	(770)
Income tax expense	(4)	(6)	(9)	(10)
Net income (loss)	$ 1,711	$ (836)	$ (498)	$ (780)
Net income (loss) per common share
Basic	$ 0.68	$ (0.31)	$ (0.19)	$ (0.29)
Diluted	$ 0.68	$ (0.31)	$ (0.19)	$ (0.29)
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,513,945	2,704,357	2,571,706	2,717,240
Diluted	2,517,936	2,704,357	2,571,706	2,717,240