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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 25, 2021 | Dec. 26, 2020
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Income Tax Disclosure [Abstract] |  |
Foreign withholding liability | $ (513,000) | $ (554,000)
Federal net operating loss carryforwards | 49,609,000 | 46,311,000
State net operating loss carryforwards | 6,393,000 | 5,454,000
Foreign net operating loss carryforwards | 994,000 | 1,319,000
Equity awards | 222,000 | 549,000
Tax credits | 9,413,000 | 9,153,000
Property, plant and equipment | 620,000 | 577,000
Unrealized losses on investments | 2,834,000 | 2,860,000
Other | 872,000 | 757,000
Net deferred tax assets | 70,444,000 | 66,426,000
Valuation allowance | (70,957,000) | (66,980,000)
Deferred tax assets, net | $ (513,000) | $ (554,000)

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