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SEGMENT AND GEOGRAPHICAL INFORMATION - Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2022
Sep. 30, 2022
Jul. 01, 2022
Apr. 01, 2022
Dec. 31, 2021
Oct. 01, 2021
Jul. 02, 2021
Apr. 02, 2021
Dec. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Segment reconciliation                      
Contract revenue $ 113,256 $ 121,399 $ 102,645 $ 91,838 $ 92,218 $ 98,297 $ 84,154 $ 79,086 $ 429,138 $ 353,755 $ 390,980
Depreciation and amortization                 17,489 17,146 18,743
Interest expense, net                 5,328 3,869 5,068
Segment profit (loss) before income tax expense                 (11,452) (12,404) (19,669)
Income tax expense (benefit) 2,584 (1,526) (1,673) (2,389) 1,370 (236) (3,663) (1,458) (3,004) (3,987) (5,173)
Net income (loss) $ (425) $ 76 $ (4,326) $ (3,773) $ (890) $ 840 $ (4,601) $ (3,766) (8,448) (8,417) (14,496)
Energy                      
Segment reconciliation                      
Contract revenue                 357,460 286,384 324,178
Depreciation and amortization                 16,507 16,156 17,666
Engineering and Consulting                      
Segment reconciliation                      
Contract revenue                 71,678 67,371 66,802
Depreciation and amortization                 982 990 1,077
Operating Segments | Energy                      
Segment reconciliation                      
Interest expense, net                 11 8 32
Segment profit (loss) before income tax expense                 (9,544) (4,808) (9,963)
Income tax expense (benefit)                 (2,504) (1,546) (2,621)
Net income (loss)                 (7,041) (3,263) (7,343)
Operating Segments | Engineering and Consulting                      
Segment reconciliation                      
Segment profit (loss) before income tax expense                 10,896 9,135 9,500
Income tax expense (benefit)                 2,858 2,936 2,499
Net income (loss)                 8,037 6,198 7,002
Corporate, Non-Segment                      
Segment reconciliation                      
Interest expense, net                 5,317 3,861 5,036
Segment profit (loss) before income tax expense                 (12,804) (16,731) (19,206)
Income tax expense (benefit)                 (3,358) (5,377) (5,051)
Net income (loss)                 (9,444) (11,352) (14,155)
Intersegment Eliminations                      
Segment reconciliation                      
Contract revenue                 $ 0 $ 0 $ 0