CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 3,136	$ 4,397	$ 9,466	$ 15,966
Cost of sales:
Cost of sales	1,794	2,274	5,252	9,061
Depreciation expense	174	278	656	837
Total cost of sales	1,968	2,552	5,908	9,898
Gross profit	1,168	1,845	3,558	6,068
Operating expenses:
Selling, general and administrative	1,351	2,136	5,049	6,137
Depreciation and amortization	65	70	187	209
Asset impairment	0	0	4,490	0
Total operating expenses	1,416	2,206	9,726	6,346
Operating loss	(248)	(361)	(6,168)	(278)
Other income:
Interest (expense) income, net	(2)	0	(4)	12
Gain (loss) on sale of property, plant and equipment	0	(7)	0	8
Total other income (expense)	(2)	(7)	(4)	20
Loss before income taxes	(250)	(368)	(6,172)	(258)
Income tax expense	0	5	5	15
Net loss	$ (250)	$ (373)	$ (6,177)	$ (273)
Net loss per share:
Basic	$ (0.02)	$ (0.03)	$ (0.49)	$ (0.02)
Fully diluted	$ (0.02)	$ (0.03)	$ (0.49)	$ (0.02)
Weighted-average shares outstanding:
Basic	12,390	13,330	12,531	13,417
Fully diluted	12,390	13,330	12,531	13,417