CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 3,550	$ 3,136	$ 12,000	$ 9,466
Cost of sales:
Cost of sales	2,569	1,794	7,518	5,252
Depreciation expense	144	174	511	656
Total cost of sales	2,713	1,968	8,029	5,908
Gross profit	837	1,168	3,971	3,558
Operating expenses:
Selling, general and administrative	1,336	1,351	4,623	5,049
Depreciation and amortization	65	65	220	187
Asset impairment	0	0	0	4,490
Total operating expenses	1,401	1,416	4,843	9,726
Operating loss	(564)	(248)	(872)	(6,168)
Other (income) expense:
Interest expense, net	1	2	8	4
Other income, net	(1,050)	0	(2,193)	0
Loss on sale of property, plant and equipment	148	0	94	0
Total other (income) expense	(901)	2	(2,091)	4
Income (loss) before income tax expense	337	(250)	1,219	(6,172)
Income tax expense	5	0	15	5
Net income (loss)	$ 332	$ (250)	$ 1,204	$ (6,177)
Net income (loss) per share:
Basic	$ 0.03	$ (0.02)	$ 0.10	$ (0.49)
Fully diluted	$ 0.03	$ (0.02)	$ 0.10	$ (0.49)
Weighted-average shares outstanding:
Basic	12,389	12,390	12,389	12,531
Fully diluted	12,445	12,390	12,441	12,531