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INCOME TAXES - Reconciliation (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
Provision for income taxes reconciliation
Computed "expected" federal income tax expense									$ (2,405)	$ (2,605)	$ (4,130)
Permanent differences									24	18	122
Nondeductible executive compensation									711	1,349	1,386
Stock options and disqualifying dispositions									576	(1,276)	4
Energy efficient building deduction									(1,378)	(558)	(738)
Current and deferred state income tax expense, net of federal benefit									(111)	(660)	(1,205)
Adjustment for uncertain tax positions											(142)
Research and development tax credit									(517)	(761)	(527)
Federal rate differential on NOL carryback										(579)
Change in valuation allowance										1,105
Other									96	(20)	57
Total provision for income taxes	$ 2,584	$ (1,526)	$ (1,673)	$ (2,389)	$ 1,370	$ (236)	$ (3,663)	$ (1,458)	$ (3,004)	$ (3,987)	$ (5,173)

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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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