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Note O - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | 37 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2011 | Dec. 31, 2019
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 47,901 | $ 44,448 |  |  |
Deferred Tax Assets, in Process Research and Development | 10,505 | 9,879 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 4,599 | 4,599 |  |  |
Deferred Tax Assets, Valuation Allowance | $ 69,680 | $ 57,721 | $ 43,462 |  | $ 25,736
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% |  |
Unrecognized Tax Benefits, Ending Balance | $ 181 | $ 181 | $ 181 |  | $ 181
Income Tax Examination, Penalties and Interest Accrued, Total | 0 | 0 | 0 |  |
Effective Income Tax Rate Reconciliation, PPP Loan Forgiveness, Amount | 0 | (1,308) | 0 |  |
Undistributed Earnings of Foreign Subsidiaries | 0 |  |  |  |
Global Technology, Inc. [Member] |  |  |  |  |
Income Tax Holiday, Aggregate Dollar Amount | $ 0 | $ 0 | $ 1,400 |  |
Income Tax Holiday, Income Tax Benefits Per Share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.05 |  |
State Administration of Taxation, China [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 25.00% |  |  |  |
State Administration of Taxation, China [Member] | Global Technology, Inc. [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 15.00% |
TAIWAN |  |  |  |  |
Operating Loss Carryforwards | $ 72,500 |  |  |  |
Operating Loss Carryforwards, Carryforward Period (Year) | 10 years |  |  |  |
CHINA |  |  |  |  |
Operating Loss Carryforwards | $ 58,800 |  |  |  |
Operating Loss Carryforwards, Carryforward Period (Year) | 10 years |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 111,500 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 32,700 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | $ 78,800 |  |  |  |
Open Tax Year | 2019 2020 2021 |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Deferred Tax Assets, in Process Research and Development | $ 10,500 |  |  |  |
Open Tax Year | 2019 2020 2021 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 4,600 |  |  |  |
Open Tax Year | 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |  |  |  |

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