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Concentrations of Risk (Tables) | 12 Months Ended
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Dec. 25, 2021
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 25, 2021 |  |  | December 26, 2020 |
Collins Aerospace |  |  | 29 | % |  |  | 45 | %
DRS Network & Imaging Systems, LLC |  |  | 35 | % |  |  | 15 | %
Sales to significant non-affiliated customers for fiscal years 2021, 2020 and 2019, as a percentage of total revenues, is as follows:
|  | Sales as a Percent of Total Revenue |
|  | Fiscal Year |
Customer |  | 2021 |  |  | 2020 |  |  | 2019 |
Defense Customers in Total |  |  | 40 | % |  |  | 50 | % |  |  | 30 | %
DRS Network & Imaging Systems, LLC |  |  | 31 | % |  |  | 35 | % |  |  | 17 | %
Collins Aerospace |  |  | 30 | % |  |  | 27 | % |  |  | * |
Realwear, Inc. |  |  | * |  |  |  | * |  |  |  | 20 | %
Funded Research and Development Contracts |  |  | 32 | % |  |  | 25 | % |  |  | 17 | %
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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