CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 3,922	$ 3,605
Cost of sales:
Cost of sales	2,011	2,241
Depreciation expense	183	241
Total cost of sales	2,194	2,482
Gross profit	1,728	1,123
Operating expenses:
Selling, general and administrative	1,535	1,693
Depreciation and amortization	77	61
Total operating expenses	1,612	1,754
Operating income (loss)	116	(631)
Other (income) expense:
Interest expense, net	13	1
Gain on sale of property, plant and equipment	(49)	0
Total other (income) expense	(36)	1
Income (loss) before income tax expense	152	(632)
Income tax expense	4	5
Net income (loss)	$ 148	$ (637)
Net income (loss) per share:
Basic	$ 0.01	$ (0.05)
Fully diluted	$ 0.01	$ (0.05)
Weighted-average shares outstanding:
Basic	12,389	12,710
Fully diluted	12,432	12,710