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Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 1,352,000 $ 1,240,000  
Description Related To Benefit Based Under Point System Each point earned is worth a fixed monetary value, 1,000 Yen per point, regardless of the level grade or zone of the employee.  Gross benefits are calculated based on the cumulative number of points earned over the service period multiplied by 1,000 Yen.  The mandatory retirement age limit is 60 years old.    
Defined Contribution Plan Employees Eligible Payroll $ 18,000    
Defined Benefit Plan, Contributions by Employer 764,000 703,000 $ 625,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan (3,301,000) (2,757,000)  
Pension Costs [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year 9,000    
Fifty Years Old [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Contribution Plan Employees Eligible Payroll 6,000    
Swiss Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Future Estimated Cash Contribution To Swiz Plan 282,000    
Defined Benefit Plan, Contributions by Employer 260,000 230,000  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (3,301,000) $ (2,757,000)  
Swiss Plan [Member] | Pension Costs [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year $ 114,000