CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 4,104	$ 5,379	$ 7,810	$ 10,987
Cost of sales:
Cost of sales	2,211	2,393	4,429	5,047
Depreciation expense	242	323	596	633
Total cost of sales	2,453	2,716	5,025	5,680
Gross profit	1,651	2,663	2,785	5,307
Operating expenses:
Selling, general and administrative	1,745	2,223	3,662	4,732
Depreciation and amortization	58	79	129	158
Total operating expenses	1,803	2,302	3,791	4,890
Operating (loss) income	(152)	361	(1,006)	417
Other income:
Interest income, net	10	12	19	26
Equity in net income of joint venture	0	94	0	94
Gain on sale of assets	439	14	439	14
Total other income	449	120	458	134
Income (loss) before income taxes	297	481	(548)	551
Income tax expense	(5)	(5)	(10)	(10)
Net income (loss)	$ 292	$ 476	$ (558)	$ 541
Net income (loss) per share:
Basic	$ 0.02	$ 0.03	$ (0.04)	$ 0.04
Fully diluted	$ 0.02	$ 0.03	$ (0.04)	$ 0.04
Weighted-average shares outstanding:
Basic	13,436	15,154	13,436	15,264
Fully diluted	13,436	15,154	13,436	15,264