INCOME TAXES - Reconciliation of income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Income taxes at the statutory rate	$ 14,124	$ 14,619	$ 11,223
Increase (decrease) resulting from:
State income taxes, net of federal tax effect	2,989	2,030	212
Nondeductible expenses	203	248	180
Domestic production activities deduction	0	0	(121)
Research and development tax credits	(2,157)	(578)	(656)
Nontaxable income attributable to noncontrolling interest	0	0	223
Tax expense (benefit) related to stock-based compensation	950	(2,396)	(803)
Enactment of the Tax Act	0	0	5,737
Nondeductible interest expense	0	4	637
Revaluation of deferred tax assets for state income taxes	(92)	(1,154)	(36)
Other	807	(921)	62
Total income tax expense	$ 16,824	$ 11,852	$ 16,658

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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