Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019
Revenue	$ 19,260	$ 12,163
Gross profit	$ 3,260	$ 1,338
Gross profit margin	16.90%	11.00%
SG&A	$ 2,133	$ 2,304
Operating income (loss)	1,127	(966)
Other income, net	1	15
Interest expense, net	(5)	(3)
Tax expense	(22)	(20)
Net income (loss)	1,101	(974)
Total assets	28,788		$ 28,686
EPCM
Revenue	5,122	5,633
Gross profit	$ 277	$ 671
Gross profit margin	5.40%	11.90%
SG&A	$ 665	$ 587
Operating income (loss)	(388)	84
Total assets	6,543		6,253
Automation
Revenue	14,138	6,530
Gross profit	$ 2,983	$ 667
Gross profit margin	21.10%	10.20%
SG&A	$ 335	$ 428
Operating income (loss)	2,648	239
Total assets	15,051		13,603
Corporate
Revenue	0	0
Gross profit	0	0
SG&A	1,133	1,289
Operating income (loss)	(1,133)	$ (1,289)
Total assets	$ 7,194		$ 8,830