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Note 15 - Income taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - Singapore
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Singapore income tax rate 17.00% 17.00% 17.00%
Difference from the effect of tax rates in a foreign jurisdiction (PRC) 19.80% (14.60%) 1.00%
Effect of preferential tax rates (20.10%) 7.90% 1.20%
Effect of changes in tax rates (23.50%) 0.00% 0.00%
Tax rebate in Singapore 8.90% (2.00%) (0.70%)
Additional R&D deduction 38.10% (10.10%) (4.60%)
Change in valuation allowance (0.50%) 36.40% 0.40%
Permanent differences (1) (33.40%) 6.90% 3.80%
Effect of true-up on NOL (74.20%) 0.00% 0.00%
Interest on uncertain tax position (26.80%) 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent (94.70%) 41.50% 18.10%