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Commintments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 1,210,000    
2020 1,112,000    
2021 921,000    
2022 616,000    
2023 201,000    
Thereafter 0    
Total minimum lease payments 4,060,000    
Rent expense 1,400,000 $ 1,500,000 $ 1,300,000
Payments to Acquire Investments 5,100,000    
Cash, Commitment to Purchase Equity Investment (RMB) $ 35,000,000.0