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SEGMENT AND GEOGRAPHICAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jul. 01, 2022 | Apr. 01, 2022 | Sep. 29, 2023 | Sep. 30, 2022
Segment reconciliation |  |  |  |  |  |  |  |
Contract revenue | $ 132,738 |  |  | $ 121,399 |  |  | $ 354,418 | $ 315,882
Depreciation and amortization | 4,190 |  |  | 4,405 |  |  | 12,518 | 13,240
Interest expense, net | 2,437 |  |  | 1,435 |  |  | 7,110 | 3,216
Segment profit (loss) before income tax expense | 2,279 |  |  | (1,450) |  |  | 4,607 | (13,611)
Income tax expense (benefit) | 713 |  |  | (1,526) |  |  | 1,712 | (5,588)
Net income (loss) | 1,566 | $ 397 | $ 932 | 76 | $ (4,326) | $ (3,773) | 2,895 | (8,023)
Energy |  |  |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |  |  |
Contract revenue | 111,030 |  |  | 102,625 |  |  | 292,330 | 262,186
Engineering and Consulting |  |  |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |  |  |
Contract revenue | 21,708 |  |  | 18,774 |  |  | 62,088 | 53,696
Operating Segments | Energy |  |  |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |  |  |
Contract revenue | 111,030 |  |  | 102,625 |  |  | 292,330 | 262,186
Depreciation and amortization | 3,854 |  |  | 4,166 |  |  | 11,655 | 12,506
Interest expense, net | 2 |  |  | 3 |  |  | 5 | 8
Segment profit (loss) before income tax expense | 2,814 |  |  | (1,815) |  |  | 6,188 | (12,525)
Income tax expense (benefit) | 852 |  |  | (1,565) |  |  | 2,300 | (5,143)
Net income (loss) | 1,961 |  |  | (250) |  |  | 3,888 | (7,382)
Operating Segments | Engineering and Consulting |  |  |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |  |  |
Contract revenue | 21,708 |  |  | 18,774 |  |  | 62,088 | 53,696
Depreciation and amortization | 336 |  |  | 239 |  |  | 863 | 734
Segment profit (loss) before income tax expense | 2,853 |  |  | 3,473 |  |  | 8,658 | 8,111
Income tax expense (benefit) | 728 |  |  | 1,781 |  |  | 3,218 | 3,330
Net income (loss) | 2,127 |  |  | 1,692 |  |  | 5,440 | 4,780
Corporate, Non-Segment |  |  |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |  |  |
Interest expense, net | 2,435 |  |  | 1,432 |  |  | 7,105 | 3,208
Segment profit (loss) before income tax expense | (3,388) |  |  | (3,108) |  |  | (10,239) | (9,197)
Income tax expense (benefit) | (867) |  |  | (1,742) |  |  | (3,806) | (3,775)
Net income (loss) | $ (2,522) |  |  | $ (1,366) |  |  | $ (6,433) | $ (5,421)

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