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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2022 | Dec. 25, 2021
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Income Tax Disclosure [Abstract] |  |
Foreign withholding liability | $ (483,000) | $ (513,000)
Federal net operating loss carryforwards | 46,618,000 | 49,609,000
State net operating loss carryforwards | 7,381,000 | 6,393,000
Foreign net operating loss carryforwards | 942,000 | 994,000
Equity awards | 34,000 | 222,000
Tax credits | 9,854,000 | 9,413,000
R&D expense amortization | 1,900,000 |
Property, plant and equipment | 624,000 | 620,000
Unrealized losses on investments | 1,406,000 | 2,834,000
Other | 2,611,000 | 872,000
Net deferred tax assets | 70,887,000 | 70,444,000
Valuation allowance | (71,370,000) | (70,957,000)
Deferred tax assets, net | $ (483,000) | $ (513,000)

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