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(10) Concentrations of Credit Rick, Significant Customers and Geographic Information (Tables)
12 Months Ended
Dec. 28, 2019
Accounting Policies [Abstract]  
Significant Customer
   Percent of Total Revenues
Significant Customer  2019  2018
A   43%   36%
B   14%   17%
C   13%   12%
Revenue derived from following countries
   Percent of Total Revenues
Country  2019  2018
United States of America   25%   33%
Germany   44%   53%
Other   31%   14%