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Employee Benefit Plans (Details) - USD ($)
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Change in Plan Assets:      
Employer contributions $ 764,000 $ 703,000 $ 625,000
Funded status pension liability, end of year (3,301,000) (2,757,000)  
Swiss Plan [Member]      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period 6,363,000 6,349,000  
Service cost 381,000 469,000  
Interest cost 53,000 65,000  
Participant contributions 260,000 230,000  
Benefits deposited (paid) (185,000) (340,000)  
Actuarial loss (gain) 721,000 (410,000)  
Prior service credit (148,000) 0  
Projected benefit obligation, end of period 7,445,000 6,363,000 6,349,000
Change in Plan Assets:      
Plan assets at fair value, beginning of period 3,606,000 3,498,000  
Actual return on plan assets 203,000 (12,000)  
Employer contributions 260,000 230,000  
Participant contributions 260,000 230,000  
Benefits deposited (paid) (185,000) (340,000)  
Plan assets at fair value, end of period 4,144,000 3,606,000 3,498,000
Funded status pension liability, end of year (3,301,000) (2,757,000)  
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:      
Actuarial loss on plan assets (932,000) (816,000)  
Actuarial loss on benefit obligation (1,902,000) (1,393,000)  
Actuarial gain (loss) recognized in current year 527,000 454,000  
Prior service credit 184,000 (6,000)  
Effect of curtailments 609,000 606,000  
Accumulated other comprehensive income (loss) (1,514,000) (1,155,000)  
Accumulated benefit obligation at end of year (6,932,000) (5,980,000)  
Japan Plan [Member]      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period 1,240,000 1,035,000  
Service cost 147,000 148,000  
Interest cost 4,000 6,000  
Benefits deposited (paid) (116,000) (17,000)  
Foreign exchange adjustment 45,000 19,000  
Actuarial loss (gain) 32,000 49,000  
Projected benefit obligation, end of period 1,352,000 1,240,000 1,035,000
Change in Plan Assets:      
Plan assets at fair value, beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Benefits deposited (paid) 0 0  
Distribution of plan assets 0 0  
Foreign exchange adjustment 0 0  
Plan assets at fair value, end of period 0 0 $ 0
Funded status pension liability, end of year (1,352,000) (1,240,000)  
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:      
Transition obligation (7,000) (14,000)  
Actuarial gain (loss) recognized in current year (35,000) (31,000)  
Prior service credit 8,000 8,000  
Net gain (loss) 122,000 125,000  
Accumulated other comprehensive income (loss) 88,000 88,000  
Accumulated benefit obligation at end of year $ (1,158,000) $ (1,078,000)