Segment Information - Schedule of Segment Information for Operation Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Revenue	$ 13,974	$ 14,255	$ 39,758	$ 41,314
Gross profit	$ 1,675	$ 2,293	$ 4,955	$ 5,959
Gross Profit Margin	12.00%	16.10%	12.50%	14.40%
SG&A	$ 2,371	$ 2,483	$ 7,125	$ 7,935
Operating income (loss)	(696)	(190)	(2,170)	(1,976)
Other income (expense), net	7	11	48	(367)
Interest expense, net	(5)	(1)	(12)	(14)
Tax expense	(22)	(17)	(73)	(31)
Net loss	(716)	(197)	(2,207)	(2,388)
Total Assets	22,138		22,138		$ 22,306
EPCM [Member]
Revenue	4,256	6,821	15,548	18,568
Gross profit	$ 75	$ 1,133	$ 1,574	$ 2,879
Gross Profit Margin	1.80%	16.60%	10.10%	15.50%
SG&A	$ 651	$ 469	$ 1,826	$ 1,426
Operating income (loss)	(576)	664	(252)	1,453
Total Assets	6,276		6,276		4,792
Automation [Member]
Revenue	9,718	7,434	24,210	22,746
Gross profit	$ 1,600	$ 1,160	$ 3,381	$ 3,080
Gross Profit Margin	16.50%	15.60%	14.00%	13.50%
SG&A	$ 427	$ 633	$ 1,246	$ 2,001
Operating income (loss)	1,173	527	2,135	1,079
Total Assets	9,906		9,906		10,550
Corporate [Member]
Revenue
Gross profit
Gross Profit Margin
SG&A	$ 1,293	$ 1,381	$ 4,053	$ 4,508
Operating income (loss)	(1,293)	$ (1,381)	(4,053)	$ (4,508)
Total Assets	$ 5,956		$ 5,956		$ 6,964