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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |
Income Tax Expense (Benefit), Total | $ 106 | $ 163 | $ 3,570 |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings | 0 |  |  |  |
Unrecognized Tax Benefits | 3,194 | 3,634 | 1,065 | $ 730 |
Deferred Tax Assets, Unrecognized Tax Benefit | 1,348 | 1,391 |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,846 | 2,243 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 523 | 315 | $ 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 1,041 | $ 518 |  |  |
Foreign Tax Jurisdiction [Member] | Australian Taxation Office [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 30.00% |  |  |  |
Income Tax Expense (Benefit), Total | $ 0 |  |  |  |
Open Tax Year | 2020 2021 2022 2023 |  |  |  |
Foreign Tax Jurisdiction [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 16.50% |  |  |  |
Income Tax Expense (Benefit), Total | $ 0 |  |  |  |
Foreign Tax Jurisdiction [Member] | State Administration of Taxation, China [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 25.00% |  |  |  |
Effective Income Tax Rate Reconciliation, at Preferential Income Tax Rate, Percent, Foreign | 15.00% |  |  |  |
Effective Income Tax Rate Reconciliation, at Preferential Income Tax Rate, Duration, Foreign (Year) | 3 years |  |  |  |
Operating Loss Carryforwards | $ 11,721 |  |  |  |
Operating Loss Carryforwards, Term (Year) | 10 years |  |  |  |
Operating Loss Carryforwards, Subject to Expiration | $ 11,748 |  |  |  |
Open Tax Year | 2018 2019 2020 2021 2022 2023 |  |  |  |
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Operating Loss Carryforwards | $ 122,818 |  |  |  | $ 18,347
Operating Loss Carryforwards, Term (Year) | 20 years |  |  |  |
Open Tax Year | 2020 2021 2022 2023 |  |  |  |

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