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Schedules of Concentration of Risk, by Risk Factor (Details) - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Accounts Receivable [Member] | Collins Aerospace Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 45.00% | 23.00% |
Accounts Receivable [Member] | DRS Network and Imaging Systems LLC Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 15.00% | 22.00% |
Accounts Receivable [Member] | Scott Safety Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage |  | 12.00% |
Accounts Receivable [Member] | RealWear, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage |  | 10.00% |
Revenue Benchmark [Member] | Collins Aerospace Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 27.00% |  | 20.00%
Revenue Benchmark [Member] | DRS Network and Imaging Systems LLC Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 35.00% | 17.00% |
Revenue Benchmark [Member] | RealWear, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage |  | 20.00% |
Revenue Benchmark [Member] | Defense Customers Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 50.00% | 30.00% | 36.00%
Revenue Benchmark [Member] | General Dynamics Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage |  |  | 11.00%
Revenue Benchmark [Member] | Funded Research and Development Contracts Member |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk percentage | 25.00% | 17.00% | 20.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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