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Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Income Tax Disclosure [Abstract]
Tax provision at federal statutory rates	$ (4,029,000)	$ (2,787,000)	$ (925,000)
State tax liability
Foreign deferred tax rate differential	(8,000)	(55,000)	(38,000)
Permanent items	5,262,000	(79,000)	238,000
Increase in net state operating loss carryforwards	(987,000)	(911,000)	(233,000)
Utilization of net operating losses for U.K. research and development refund	(24,000)	(134,000)	(151,000)
Provision to tax return adjustments and tax rate change	(36,000)	(69,000)	(180,000)
Tax credits	(441,000)	(261,000)	9,000
Equity compensation	(188,000)	326,000	(121,000)
Uncertain tax position for transfer pricing	143,000	128,000	129,000
Other, net	38,000	(6,000)	(14,000)
Change in valuation allowance	414,000	3,977,000	1,415,000
Total provision for income taxes	$ 144,000	$ 129,000	$ 129,000

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