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Intangible assets, net (Tables)
12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of intangible assets, net
          
   Useful  Gross value  Accumulated amortization  Net carrying amount
   Life  At December 31,
   Years  2024  2023  2024  2023  2024  2023
Software  14  US$ 75,810   US$ 58,281   US$ (49,853)  US$ (42,062)  US$ 25,957   US$ 16,219 
           
Balance as of January 1, 2023      US$ 12,725 
  Additions        10,387 
  Amortization        (6,895)
  Exchange differences        2 
Balance as of December 31, 2023        16,219 
  Additions        17,598 
  Amortization        (7,849)
  Exchange differences        (11)
Balance as of December 31, 2024      US$ 25,957