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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2019 USD ($)	Sep. 27, 2019 USD ($)	Jun. 28, 2019 USD ($)	Mar. 29, 2019 USD ($)	Dec. 28, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 27, 2019 USD ($) segment	Dec. 28, 2018 USD ($)	Dec. 29, 2017 USD ($)	Dec. 30, 2016 USD ($)
SEGMENT INFORMATION
Number of operating segments | segment									2
Number of reporting segments | segment									2
Segment reconciliation
Contract revenue	$ 129,416	$ 117,494	$ 104,396	$ 91,793	$ 86,438	$ 71,386	$ 59,833	$ 54,595	$ 443,099	$ 272,252	$ 273,352
Depreciation and amortization									15,027	6,060	3,949
Interest expense									4,900	700	(111)
Segment profit (loss) before income tax expense									4,656	12,161	13,691
Income tax expense (benefit)	1,188	(376)	(70)	(927)	(93)	1,597	869	(242)	(185)	2,131	1,562
Net income (loss)	3,202	$ 416	$ 1,640	$ (417)	1,201	$ 3,311	$ 3,315	$ 2,203	4,841	10,030	12,129
Segment assets(1)	439,913				300,911				439,913	300,911	138,172
Energy
Segment reconciliation
Contract revenue									370,715	196,833
Engineering and Consulting
Segment reconciliation
Contract revenue									72,384	75,419
Reporting Segments | Energy
Segment reconciliation
Contract revenue									370,715	196,833	199,609
Depreciation and amortization									13,703	5,274	3,145
Interest expense									32	312	(90)
Segment profit (loss) before income tax expense									11,971	8,959	5,589
Income tax expense (benefit)									3,308	1,570	638
Net income (loss)									8,664	7,390	4,951
Segment assets(1)	314,324				252,124				314,324	252,124	65,872
Reporting Segments | Engineering and Consulting
Segment reconciliation
Contract revenue									72,384	75,419	73,743
Depreciation and amortization									1,324	786	804
Interest expense										388	(21)
Segment profit (loss) before income tax expense									8,839	7,589	9,054
Income tax expense (benefit)									2,442	1,330	1,033
Net income (loss)									6,397	6,259	8,021
Segment assets(1)	23,690				20,402				23,690	20,402	20,774
Unallocated Corporate
Segment reconciliation
Interest expense									4,868
Segment profit (loss) before income tax expense									(16,154)	(4,387)	(952)
Income tax expense (benefit)									(5,935)	(769)	(109)
Net income (loss)									(10,220)	(3,619)	(843)
Segment assets(1)	125,029				51,515				125,029	51,515	74,656
Intersegment
Segment reconciliation
Contract revenue										0	0	$ 0
Segment assets(1)	$ (23,130)				$ (23,130)				$ (23,130)	$ (23,130)	$ (23,130)

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