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Note 7 - Income Taxes - Foreign Rate Differentials (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Foreign | $ 1,613 | $ 1,927
Department for International Tax Cooperation [Member] |  |
Statutory Tax Rate | 0.00% |
Foreign | $ 1,535 | 2,005
Inland Revenue, Hong Kong [Member] |  |
Statutory Tax Rate | 16.50% |
Foreign | $ 745 | 665
State Administration of Taxation, China [Member] |  |
Statutory Tax Rate | 25.00% |
Foreign | $ (124) | $ 48

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