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Concentrations of Risk (Tables)
 12 Months Ended
Dec. 28, 2019
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
Ongoing credit evaluations of customers’ financial condition are performed and collateral, such as letters of credit, are generally not required. Customer’s accounts receivable balance as a percentage of total accounts receivable was as follows:
 
Percent of Gross
Accounts Receivable
Customer
December 28,
2019
 
December 29,
2018
Collins Aerospace
23%
 
11%
DRS Network & Imaging Systems, LLC
22%
 
11%
Scott Safety
12%
 
*
RealWear, Inc.
10%
 
31%
Note: The symbol “*” indicates that accounts receivables from that customer were less than 10% of the Company’s total accounts receivable.
Sales to significant non-affiliated customers for fiscal years 2019, 2018 and 2017, as a percentage of total revenues, is as follows:
 
Sales as a Percent
of Total Revenue
 
Fiscal Year
Customer
2019
 
2018
 
2017
Military Customers in Total
30%
 
36%
 
48%
Collins Aerospace
*
 
20%
 
10%
DRS Network & Imaging Systems, LLC
17%
 
*
 
10%
General Dynamics
*
 
11%
 
*
RealWear, Inc.
20%
 
*
 
*
U.S. Army
*
 
*
 
12%
Funded Research and Development Contracts
17%
 
20%
 
11%

Note: The symbol “*” indicates that sales to that customer were less than 10% of the Company’s total revenues. The caption "Military Customers in Total" excludes research and development contracts.