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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Swiss Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 381 $ 469 $ 316
Interest cost 53 65 74
Expected return on plan assets (94) (89) (93)
Actuarial loss recognized in current year 72 111 64
Prior service credit (7) (7) 0
Net periodic pension cost 405 549 361
Japan Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 147 148 121
Interest cost 4 6 6
Net amortization of transition obligation 11 12 11
Actuarial loss recognized in current year (1) (13) (15)
Prior service credit (3) (1) (2)
Net periodic pension cost $ 158 $ 152 $ 121