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Note 15 - Income taxes (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 SGD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Percentage of Taxable Income | $ 50 |  |  |
Operating Loss Carryforwards | 2,675,217 |  | $ 2,524,351 |
Unrecognized Tax Benefits | 240,930 |  | 247,697 |
Interest Payable, Current | $ 78,894 |  | $ 0 | $ 0
Foreign Investment Enterprises | Peoples Republic Of China |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 25.00% | 25.00% |  |
High and New Technology Enterprises | Peoples Republic Of China |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 15.00% | 15.00% |  |
Singapore, Dollars |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 17.00% | 17.00% |  |
Percentage of Taxable Income | $ 75 |  |  |
Taxable Income Exempt From Income Tax, First Portion |  | $ 10,000 |  |
Taxable Income Exempt From Income Tax, Remainder |  | $ 190,000 |  |
United States of America, Dollars |  |  |  |
Taxable Income Exempt From Income Tax, First Portion | 7,300 |  |  |
Taxable Income Exempt From Income Tax, Remainder | $ 139,000 |  |  |

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