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Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) | 12 Months Ended
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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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