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Note 7 - Income Taxes - Foreign Rate Differentials (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Foreign | $ 1,584 | $ 2,637
Department for International Tax Cooperation [Member] |  |
Statutory Tax Rate | 0.00% |
Foreign | $ 1,104 | 2,696
Inland Revenue, Hong Kong [Member] |  |
Statutory Tax Rate | 16.50% |
Foreign | $ 1,105 | 742
State Administration of Taxation, China [Member] |  |
Statutory Tax Rate | 25.00% |
Foreign | $ 143 | $ 152

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