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Note D - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Deferred Tax Assets, Valuation Allowance, Total | $ 99,958 | $ 81,401 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 1,327 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 74 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 18,557 |  |  |
Undistributed Earnings, Basic, Total | 4,000 |  |  |
Incremental Taxes | 400 |  |  |
Unrecognized Tax Benefits, Ending Balance | 1,008 | 1,528 | $ 560 | $ 282
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | $ 91 | 491 |  |
Open Tax Year | 2017 2018 2019 2020 2021 |  |  |
Other Current Liabilities [Member] |  |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 199 | 538 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 162 | 243 |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Unrecognized Tax Benefits, Ending Balance | 809 | 990 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 63 | $ 248 |  |
Mirrored Deferred Tax Assets Recorded in the U.S. to Offset Deferred Tax Liabilities of Foreign Disregarded Entities [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 1,964 |  |  |
Foreign Operating Loss Carryforwards [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 1,327 |  |  |
Other Foreign Deferred Tax Assets [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 99,958 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards, Total | 4,122 |  |  |
Operating Loss Carryforwards, Not Subject to Expiration | 3,926 |  |  |
Research Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] |  |  |  |
Tax Credit Carryforward, Amount | 93,934 |  |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | Utah State Tax Commission [Member] |  |  |  |
Tax Credit Carryforward, Amount | 1,362 |  |  |
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] |  |  |  |
Tax Credit Carryforward, Amount | $ 1,339 |  |  |

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