CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 12,977	$ 18,915
Cost of sales:
Cost of sales	7,232	11,013
Depreciation expense	830	1,105
Total cost of sales	8,062	12,118
Gross profit	4,915	6,797
Operating expenses:
Selling, general and administrative	6,210	8,926
Asset impairment	4,490	396
Depreciation and amortization	252	276
Total operating expenses	10,952	9,598
Operating loss	(6,037)	(2,801)
Other expense (income):
Interest expense (income), net	7	(12)
(Gain) on sale of property, plant and equipment	0	(7)
Total other expense (income)	7	(19)
Loss before income taxes	(6,044)	(2,782)
Income tax expense (benefit)	13	(8)
Net loss	$ (6,057)	$ (2,774)
Net loss per share:
Basic	$ (0.48)	$ (0.21)
Fully diluted	$ (0.48)	$ (0.21)
Weighted-average shares outstanding:
Basic	12,495	13,386
Fully diluted	12,495	13,386