Segment Information - Schedule of Segment Information for Operation Statement (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 26, 2015	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Revenue	$ 15,968	$ 18,210			$ 44,622	$ 62,365
Gross profit	3,881	3,773			7,407	12,504
SG&A expense	3,511	3,350			10,214	10,909
Operating income (loss)	370	423			(2,807)	1,595
Other income, net	10	(4)			17	641
Interest expense, net	(44)	(32)			(129)	(98)
Income tax benefit	153	(67)			1,056	(219)
Net income	489	$ 320			(1,863)	1,919
EPCM [Member]
Revenue	8,216			$ 11,945	25,000	38,174
Gross profit	1,454			1,720	2,877	5,852
SG&A expense	909			653	2,432	2,116
Operating income (loss)	545			$ 1,067	445	3,736
Automation [Member]
Revenue	7,752		$ 6,265		19,622	24,191
Gross profit	2,427		2,053		4,530	6,652
SG&A expense	685		584		2,203	1,869
Operating income (loss)	1,742		1,469		2,327	4,783
Corporate [Member]
Revenue
Gross profit
SG&A expense	1,917		2,113		5,579	6,924
Operating income (loss)	$ (1,917)		$ (2,113)		$ (5,579)	$ (6,924)