CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 4,397	$ 3,912	$ 15,966	$ 11,722
Cost of sales:
Cost of sales	2,274	2,089	9,061	6,518
Depreciation expense	278	275	837	871
Total cost of sales	2,552	2,364	9,898	7,389
Gross profit	1,845	1,548	6,068	4,333
Operating expenses:
Selling, general and administrative	2,136	2,145	6,137	5,804
Depreciation and amortization	70	57	209	188
Total operating expenses	2,206	2,202	6,346	5,992
Operating loss	(361)	(654)	(278)	(1,659)
Other (loss) income:
Interest income, net	0	10	12	28
(Loss) Gain on sale of property, plant and equipment	(7)	0	8	439
Total (loss) other income	(7)	10	20	467
Loss before income taxes	(368)	(644)	(258)	(1,192)
Income tax expense	(5)	(5)	(15)	(15)
Net loss	$ (373)	$ (649)	$ (273)	$ (1,207)
Net loss per share:
Basic	$ (0.03)	$ (0.05)	$ (0.02)	$ (0.09)
Fully diluted	$ (0.03)	$ (0.05)	$ (0.02)	$ (0.09)
Weighted-average shares outstanding:
Basic	13,330	13,648	13,417	13,507
Fully diluted	13,330	13,648	13,417	13,507