CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 5,269	$ 4,104	$ 11,568	$ 7,810
Cost of sales:
Cost of sales	3,022	2,211	6,787	4,429
Depreciation expense	282	242	559	596
Total cost of sales	3,304	2,453	7,346	5,025
Gross profit	1,965	1,651	4,222	2,785
Operating expenses:
Selling, general and administrative	2,007	1,745	4,001	3,662
Depreciation and amortization	70	58	138	129
Total operating expenses	2,077	1,803	4,139	3,791
Operating (loss) income	(112)	(152)	83	(1,006)
Other income:
Interest income, net	5	10	12	19
Gain on sale of property, plant and equipment	0	439	15	439
Total other income	5	449	27	458
(Loss) income before income taxes	(107)	297	110	(548)
Income tax expense	(5)	(5)	(10)	(10)
Net (loss) income	$ (112)	$ 292	$ 100	$ (558)
Net (loss) income per share:
Basic	$ (0.01)	$ 0.02	$ 0.01	$ (0.04)
Fully diluted	$ (0.01)	$ 0.02	$ 0.01	$ (0.04)
Weighted-average shares outstanding:
Basic	13,412	13,436	13,461	13,436
Fully diluted	13,412	13,436	13,461	13,436