Consolidated Statements of Operations and Other Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 14,514	$ 9,876
Cost of sales	9,908	7,261
Gross profit	4,606	2,615
Operating expenses:
Sales and marketing	1,287	1,042
General and administration	6,671	4,480
Research and development	633	332
Total operating expenses	8,591	5,854
Gain on sale of real estate	1,892
Loss from operations	(2,093)	(3,239)
Interest income, net	62	133
Interest expense	(295)
Loss from continuing operations	(2,326)	(3,106)
Discontinued Operations:
Income (loss) from discontinued operations	201	(40)
Income (loss) from discontinued operations	201	(40)
Net loss	(2,125)	(3,146)
Other comprehensive loss:
Unrealized gain (loss) on marketable debt securities	(9)	22
Total comprehensive loss	$ (2,134)	$ (3,124)
Basic and diluted earnings (loss) per share:
Loss from continuing operations	$ (0.20)	$ (0.27)
Income (loss) from discontinued operations	0.02	(0.00)
Net loss per share	$ (0.18)	$ (0.27)
Weighted average common shares outstanding:
Basic and diluted	11,595	11,564