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Suppliers and contractors (Tables)
 6 Months Ended
Jun. 30, 2023
Notes and other explanatory information [abstract]  
Schedule of amount due to suppliers and contractors
     
  Notes June 30, 2023 December 31, 2022
Third parties – Brazil   3,318 2,691
Third parties – Abroad   1,753 1,599
Related parties 29 169 171
Total   5,240 4,461