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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 26, 2020	Dec. 28, 2019
Income Tax Disclosure [Abstract]
Foreign withholding liability	$ (554,000)	$ (525,000)
Federal net operating loss carryforwards	46,311,000	44,820,000
State net operating loss carryforwards	5,454,000	5,097,000
Foreign net operating loss carryforwards	1,319,000	1,293,000
Equity awards	549,000	428,000
Tax credits	9,153,000	9,161,000
Property, plant and equipment	577,000	524,000
Unrealized losses on investments	2,860,000	2,641,000
Other	757,000	1,603,000
Net deferred tax assets	66,426,000	65,042,000
Valuation allowance	(66,980,000)	(65,566,000)
Deferred tax assets net	$ (554,000)	$ (524,000)

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