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