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Note 7 - Income Taxes - Foreign Rate Differentials (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Foreign | $ 3,153 | $ (680)
Department for International Tax Cooperation [Member] |  |
Statutory Tax Rate | 0.00% |
Foreign | $ 2,589 | (2,746)
Inland Revenue, Hong Kong [Member] |  |
Statutory Tax Rate | 16.50% |
Foreign | $ 267 | 3,441
State Administration of Taxation, China [Member] |  |
Statutory Tax Rate | 25.00% |
Foreign | $ 716 | $ (1,644)

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