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Note 7 - Income Taxes - Foreign Rate Differentials (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Income tax at U.S. federal statutory tax rate, percent | 21.00% | 21.00%
Foreign, amount | $ 160 | $ 1,613
Department for International Tax Cooperation [Member] |  |
Income tax at U.S. federal statutory tax rate, percent | 0.00% |
Foreign, amount | $ 759 | 1,535
Inland Revenue, Hong Kong [Member] |  |
Income tax at U.S. federal statutory tax rate, percent | 16.50% |
Foreign, amount | $ 444 | 745
State Administration of Taxation, China [Member] |  |
Income tax at U.S. federal statutory tax rate, percent | 5.00% |
Foreign, amount | $ (439) | $ (124)

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