CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 4,528	$ 2,725	$ 8,450	$ 6,330
Cost of sales:
Cost of sales	2,938	1,216	4,949	3,458
Depreciation expense	184	242	367	482
Total cost of sales	3,122	1,458	5,316	3,940
Gross profit	1,406	1,267	3,134	2,390
Operating expenses:
Selling, general and administrative	1,752	2,005	3,287	3,698
Depreciation and amortization	78	61	155	122
Asset impairment	0	4,490	0	4,490
Total operating expenses	1,830	6,556	3,442	8,310
Operating loss	(424)	(5,289)	(308)	(5,920)
Other (income) expense:
Interest expense, net	8	1	21	2
Other income, net	(1,156)	0	(1,156)	0
Gain on sale of property, plant and equipment	(6)	0	(55)	0
Total other (income) expense	(1,154)	1	(1,190)	2
Income (loss) before income tax expense	730	(5,290)	882	(5,922)
Income tax expense	6		10	5
Net income (loss)	$ 724	$ (5,290)	$ 872	$ (5,927)
Net income (loss) per share:
Basic	$ 0.06	$ (0.42)	$ 0.07	$ (0.47)
Fully diluted	$ 0.06	$ (0.42)	$ 0.07	$ (0.47)
Weighted-average shares outstanding:
Basic	12,389	12,492	12,389	12,601
Fully diluted	12,444	12,492	12,439	12,601