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INCOME TAXES - Uncertain tax benefits (Details)
12 Months Ended
Dec. 28, 2018
USD ($)
Reconciliation of unrecognized tax benefits  
Balance as of December 29, 2017 $ 424,000
Additions for tax positions of prior years 5,000
Reductions for tax positions of prior years (287,000)
Balance as of December 28, 2018 $ 142,000