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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 30, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Foreign withholding liability $ (471,000) $ (483,000)
Federal net operating loss carryforwards 49,213,000 46,618,000
State net operating loss carryforwards 7,881,000 7,381,000
Foreign net operating loss carryforwards 1,183,000 942,000
Equity awards 37,000 34,000
Tax credits 9,849,000 9,854,000
R&D expense amortization 2,316,000 1,900,000
Property, plant and equipment 598,000 624,000
Unrealized losses on investments 2,292,000 1,406,000
Inventory reserves 1,212,000 1,119,000
Other 1,587,000 1,492,000
Net deferred tax assets 75,697,000 70,887,000
Valuation allowance (76,168,000) (71,370,000)
Deferred tax assets, net $ (471,000) $ (483,000)