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Concentrations of Risk (Tables) | 12 Months Ended
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Dec. 26, 2020
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: Schedules of Concentration of Risk, by Risk Factor
|  | Percent of Gross Accounts Receivable |
Customer |  | December 26, 2020 |  |  | December 28, 2019 |
Collins Aerospace |  |  | 45 | % |  |  | 23 | %
DRS Network & Imaging Systems, LLC |  |  | 15 | % |  |  | 22 | %
Scott Safety |  |  | * |  |  |  | 12 | %
RealWear, Inc. |  |  | * |  |  |  | 10 | %
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 2020, 2019 and 2018, as a percentage of total revenues, is as follows:
|  | Sales as a Percent of Total Revenue |
|  | Fiscal Year |
Customer |  | 2020 |  |  | 2019 |  |  | 2018 |
Defense Customers in Total |  |  | 50 | % |  |  | 30 | % |  |  | 36 | %
General Dynamics |  |  | * |  |  |  | * |  |  |  | 11 | %
DRS Network & Imaging Systems, LLC |  |  | 35 | % |  |  | 17 | % |  |  | * |
Collins Aerospace |  |  | 27 | % |  |  | * |  |  |  | 20 | %
RealWear, Inc. |  |  | * |  |  |  | 20 | % |  |  | * |
Funded Research and Development Contracts |  |  | 25 | % |  |  | 17 | % |  |  | 20 | %
Note: The symbol “*” indicates that sales to that customer were less than 10% of the Company’s total revenues. The caption “Defense Customers in Total” excludes research and development contracts.

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