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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 25, 2021	Dec. 26, 2020
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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