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Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Tax provision at federal statutory rates	$ (925,000)	$ (6,196,000)	$ (7,515,000)
State tax liability		4,000	5,000
Foreign deferred tax rate differential	(38,000)	(64,000)	(39,000)
Foreign withholding			301,000
Outside basis in Kowon, net unremitted earnings			(468,000)
Permanent items	238,000	1,964,000	186,000
Increase in net state operating loss carryforwards	(233,000)	(1,985,000)	(406,000)
Utilization of net operating losses for U.K. research and development refund	(151,000)	(148,000)
Provision to tax return adjustments and tax rate change (1)	(180,000)	803,000	(76,000)
Tax credits	9,000	(1,931,000)	239,000
Non-deductible 162M compensation limitations			13,000
Non-deductible equity compensation	(121,000)	16,000	290,000
Uncertain tax position for transfer pricing	129,000	105,000	91,000
Other, net	(14,000)	(22,000)	45,000
Change in valuation allowance	1,415,000	7,562,000	7,364,000
Total provision	$ 129,000	$ 108,000	$ 30,000

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