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Note 4 - Summary of Significant Accounting Policies - Exchange Rates Used to Translate Amounts in RMB into US (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Balance sheet items, except for equity accounts | 6.9194 |  | 7.0288
Items in the statements of operations and comprehensive loss | 6.9493 | 7.1429 |

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- Definition Represents the foreign currency exchange rate derived from an average. + References No definition available. + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479424/830-30-S99-1 + Details
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