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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