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INCOME TAXES - Operating Loss Carryovers and Unrecognized Tax Benefits (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 27, 2019	Dec. 28, 2018	Dec. 31, 2017	Dec. 29, 2017
Income taxes
U.S. federal statutory rate (as a percent)									21.00%	21.00%	35.00%	34.00%
Valuation reserve related to California net operating losses	$ 86,000				$ 86,000				$ 86,000	$ 86,000
Unrecognized tax benefits					142,000					142,000		$ 424,000
Income tax expense (benefit)	$ 1,188,000	$ (376,000)	$ (70,000)	$ (927,000)	(93,000)	$ 1,597,000	$ 869,000	$ (242,000)	$ (185,000)	2,131,000		$ 1,562,000
Reconciliation of unrecognized tax benefits
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions										5,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions										287,000
Maximum
Income taxes
U.S. federal statutory rate (as a percent)												35.00%
Federal
Income taxes
Operating loss carryovers					72,700,000					72,700,000
State
Income taxes
Operating loss carryovers					$ 58,000,000					$ 58,000,000

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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