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(10) Concentrations of Credit Risk Significant Customers and Geographic Information (Tables)
12 Months Ended
Dec. 30, 2017
Risks and Uncertainties [Abstract]  
Revenues from significant customers as a percent of total revenues in 2017, 2016 and 2015
     Percent of Total Revenues  
Significant Customer    2017      2016      2015  
A   28%  19%   27%
B   14%   19%   23%
C   9%   10%   10%
D   13%   <10%    <10% 
The Company's revenue wasderived from the following countries in 2017, 2016 and 2015
     Percent of Total Revenues  
Country    2017      2016      2015  
United States of America   30%   29%   21%
Germany   42%   38%   50%
Other   28%   33%   29%