CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 3,912	$ 3,470	$ 11,722	$ 14,458
Cost of sales:
Cost of sales	2,089	2,103	6,518	7,151
Depreciation expense	275	333	871	966
Total cost of sales	2,364	2,436	7,389	8,117
Gross profit	1,548	1,034	4,333	6,341
Operating expenses:
Selling, general and administrative	2,145	2,264	5,804	6,995
Depreciation and amortization	57	79	188	238
Total operating expenses	2,202	2,343	5,992	7,233
Operating loss	(654)	(1,309)	(1,659)	(892)
Other income:
Interest income, net	10	21	28	46
Equity in net income of joint venture	0	0	0	94
Gain on sale of assets	0	559	439	574
Total other income	10	580	467	714
Loss before income taxes	(644)	(729)	(1,192)	(178)
Income tax expense	(5)	(5)	(15)	(15)
Net loss	$ (649)	$ (734)	$ (1,207)	$ (193)
Net loss per share:
Basic	$ (0.05)	$ (0.05)	$ (0.09)	$ (0.01)
Fully diluted	$ (0.05)	$ (0.05)	$ (0.09)	$ (0.01)
Weighted-average shares outstanding:
Basic	13,648,000	14,695,000	13,507,000	15,074,000
Fully diluted	13,648,000	14,695,000	13,507,000	15,074,000