Segment Information - Schedule of Segment Information for Operation Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Revenue	$ 14,255	$ 12,896	$ 41,314	$ 41,336
Gross profit	$ 2,293	$ 1,621	$ 5,959	$ 5,865
Gross Profit Margin	16.10%	12.60%	14.40%	14.20%
SG&A	$ 2,483	$ 3,041	$ 7,935	$ 9,503
Operating income (loss)	(190)	(1,420)	(1,976)	(3,638)
Other income	11	2	(367)	57
Interest expense, net	(1)	(19)	(14)	(95)
Tax expense	(17)	(10,717)	(31)	(10,250)
Net loss	(197)	(12,154)	(2,388)	(13,926)
Total Assets	24,260		24,260		$ 29,252
EPCM [Member]
Revenue	6,821	5,399	18,568	16,976
Gross profit	$ 1,133	$ 411	$ 2,879	$ 1,742
Gross Profit Margin	16.60%	7.60%	15.50%	10.30%
SG&A	$ 469	$ 516	$ 1,426	$ 1,614
Operating income (loss)	664	(105)	1,453	128
Total Assets	6,457		6,457		5,976
Automation [Member]
Revenue	7,434	7,497	22,746	24,360
Gross profit	$ 1,160	$ 1,210	$ 3,080	$ 4,123
Gross Profit Margin	15.60%	16.10%	13.50%	16.90%
SG&A	$ 633	$ 699	$ 2,001	$ 2,106
Operating income (loss)	527	511	1,079	2,017
Total Assets	12,388		12,388		12,485
Corporate [Member]
Revenue
Gross profit
Gross Profit Margin
SG&A	$ 1,381	$ 1,826	$ 4,508	$ 5,783
Operating income (loss)	(1,381)	$ (1,826)	(4,508)	$ (5,783)
Total Assets	$ 5,415		$ 5,415		$ 10,791