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INCOME TAXES - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2024	Sep. 27, 2024	Jun. 28, 2024	Mar. 29, 2024	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Provision for income taxes reconciliation
Computed "expected" federal income tax expense									$ 5,603	$ 3,064	$ (2,405)
Permanent differences									52	194	24
Nondeductible executive compensation									600	121	711
Stock options and disqualifying dispositions									(910)	560	576
Energy efficient building deduction									(2,053)	(717)	(1,378)
Current and deferred state income tax expense, net of federal benefit									1,694	1,250	(111)
Research and development tax credit									(813)	(867)	(517)
Change in valuation allowance									(85)
Other									21	60	96
Total provision for income taxes	$ 2,246	$ 157	$ 720	$ 986	$ 1,953	$ 713	$ 243	$ 756	$ 4,109	$ 3,665	$ (3,004)

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