CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 3,601	$ 3,922
Cost of sales:
Cost of sales	2,051	2,011
Depreciation expense	136	183
Total cost of sales	2,187	2,194
Gross profit	1,414	1,728
Operating expenses:
Selling, general and administrative	1,666	1,535
Depreciation and amortization	60	77
Total operating expenses	1,726	1,612
Operating income (loss)	(312)	116
Other (income) expense:
Interest expense, net	3	13
Other income, net	(2)	0
Gain on sale of property, plant and equipment	(54)	(49)
Total other (income) expense	(53)	(36)
Income (loss) before income tax expense	(259)	152
Income tax expense	5	4
Net income (loss)	$ (264)	$ 148
Net income (loss) per share:
Basic	$ (0.02)	$ 0.01
Fully diluted	$ (0.02)	$ 0.01
Weighted-average shares outstanding:
Basic	12,157	12,389
Fully diluted	12,217	12,432