Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales (Note 3)	$ 3,407	$ 771
Cost of sales (Note 3)	1,982	686
Gross profit	1,425	85
Operating expenses (Note 3):
Sales and marketing	172	115
Administration	1,219	1,080
Research and development	87	34
Total operating expenses	1,478	1,229
Interest income (expense), net	96	(54)
Income (loss) from continuing operations before income taxes (Note 7)	43	(1,198)
Income tax benefit from continuing operations		453
Income from continuing operations	43	(745)
Discontinued operations (Note 4):
Income from discontinued operations		1,365
Gain on sale of discontinued operations, net of taxes		43,268
Income from discontinued operations		44,633
Net income	43	43,888
Other comprehensive income:
Unrealized loss on marketable securities	(43)
Total comprehensive income	$ 0	$ 43,888
Basic earnings (loss) per share:
Income (loss) from continuing operations	$ 0	$ (0.04)
Income from discontinued operations		2.61
Net income	0	2.57
Diluted earnings (loss) per share:
Income (loss) from continuing operations	0	(0.04)
Income from discontinued operations		2.51
Net income	$ 0	$ 2.47
Weighted average common shares outstanding:
Basic	11,130,000	17,082,000
Diluted	11,413,000	17,772,000