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INCOME TAXES - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 30, 2022	Sep. 30, 2022	Jul. 01, 2022	Apr. 01, 2022	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Provision for income taxes reconciliation
Computed "expected" federal income tax expense									$ 3,064	$ (2,405)	$ (2,605)
Permanent differences									194	24	18
Nondeductible executive compensation									121	711	1,349
Stock options and disqualifying dispositions									560	576	(1,276)
Energy efficient building deduction									(717)	(1,378)	(558)
Current and deferred state income tax expense, net of federal benefit									1,250	(111)	(660)
Research and development tax credit									(867)	(517)	(761)
Federal rate differential on NOL carryback											(579)
Change in valuation allowance											1,105
Other									60	96	(20)
Total provision for income taxes	$ 1,953	$ 713	$ 243	$ 756	$ 2,584	$ (1,526)	$ (1,673)	$ (2,389)	$ 3,665	$ (3,004)	$ (3,987)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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