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Concentrations of Risk (Tables) | 12 Months Ended
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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.

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