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SEGMENT AND GEOGRAPHICAL INFORMATION - Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2022
Apr. 01, 2022
Jul. 02, 2021
Apr. 02, 2021
Jul. 01, 2022
Jul. 02, 2021
Segment reconciliation            
Contract revenue $ 102,645   $ 84,154   $ 194,483 $ 163,240
Depreciation and amortization 4,426   4,224   8,835 8,411
Interest expense, net 1,030   1,099   1,781 2,163
Segment profit (loss) before income tax expense (5,999)   (8,264)   (12,161) (13,488)
Income tax expense (benefit) (1,673)   (3,663)   (4,062) (5,121)
Net income (loss) (4,326) $ (3,773) (4,601) $ (3,766) (8,099) (8,367)
Energy            
Segment reconciliation            
Contract revenue 84,675   66,446   159,561 128,453
Depreciation and amortization 4,183   3,973   8,340 7,911
Interest expense, net         5 5
Segment profit (loss) before income tax expense         (10,710) (7,745)
Income tax expense (benefit)         (3,578) (2,941)
Net income (loss)         (7,132) (4,804)
Engineering and Consulting            
Segment reconciliation            
Contract revenue 17,970   17,708   34,922 34,787
Depreciation and amortization 243   251   495 500
Segment profit (loss) before income tax expense         4,638 4,834
Income tax expense (benefit)         1,549 1,836
Net income (loss)         3,088 2,999
Operating Segments [Member] | Energy            
Segment reconciliation            
Interest expense, net 1   1      
Segment profit (loss) before income tax expense (6,357)   (4,913)      
Income tax expense (benefit) (1,891)   (2,151)      
Net income (loss) (4,467)   (2,762)      
Operating Segments [Member] | Engineering and Consulting            
Segment reconciliation            
Segment profit (loss) before income tax expense 2,531   2,724      
Income tax expense (benefit) 732   1,247      
Net income (loss) 1,798   1,478      
Corporate, Non-Segment [Member]            
Segment reconciliation            
Interest expense, net 1,029   1,098   1,776 2,158
Segment profit (loss) before income tax expense (2,173)   (6,075)   (6,089) (10,577)
Income tax expense (benefit) (514)   (2,759)   (2,033) (4,016)
Net income (loss) (1,657)   (3,317)   (4,055) (6,562)
Intersegment Eliminations [Member]            
Segment reconciliation            
Contract revenue $ 0   $ 0   $ 0 $ 0