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Note 7 - Income Taxes - Foreign Rate Differentials (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Foreign | $ 1,927 | $ 1,584
Department for International Tax Cooperation [Member] |  |
Statutory Tax Rate | 0.00% |
Foreign | $ 2,005 | 1,104
Inland Revenue, Hong Kong [Member] |  |
Statutory Tax Rate | 16.50% |
Foreign | $ 665 | 1,105
State Administration of Taxation, China [Member] |  |
Statutory Tax Rate | 25.00% |
Foreign | $ 48 | $ 143

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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