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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2022
Dec. 25, 2021
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)