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BUSINESS COMBINATIONS - Pro Forma Information - Tabular Disclosure (Details) - Alternative Power Generation, Inc., Alternative Power Generation, Inc., and Enica Engineering, PLLC - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2025	Jun. 28, 2024	Jul. 04, 2025	Jun. 28, 2024
Business Acquisition, Pro Forma Information
Pro forma revenue	$ 173,473	$ 153,771	$ 329,730	$ 289,138
Pro forma income (loss) from operations	11,815	8,708	18,600	16,700
Pro forma net income (loss)	$ 15,434	$ 6,562	$ 19,793	$ 11,550
Earnings (loss) per share, basic (in dollars per share)	$ 1.07	$ 0.48	$ 1.38	$ 0.85
Earnings (loss) per share, diluted (in dollars per share)	$ 1.03	$ 0.47	$ 1.34	$ 0.82
Weighted average shares outstanding, basic (in shares)	14,444	13,725	14,298	13,665
Weighted average shares outstanding, diluted (in shares)	14,917	14,074	14,778	14,001

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