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Note 9 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
Deferred Tax Assets, Valuation Allowance | $ 89,234 | $ 76,250 |
Increase (Decrease) of Net Income Due to Impact of Tax Holidays |  | $ 4,500 | $ 3,600
Increase (Decrease) of Earning Per Share Due To Impact Of Tax Holidays (in dollars per share) |  | $ 0.09 | $ 0.09
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 5,800 | $ 5,300 | $ 5,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 600 | 800 |
Unrecognized Tax Benefits, Interest Expense, Net of Accrued Interest Reversed | $ (100) | $ (200) | $ (300)
Minimum [Member] |  |  |
Collection Term Range (Year) | 4 years |  |
Maximum [Member] |  |  |
Collection Term Range (Year) | 10 years |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards | $ 140,000 |  |
Tax Credit Carryforward, Amount | 3,700 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | 113,900 |  |
Tax Credit Carryforward, Amount | 32,900 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards | $ 9,000 |  |

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