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Intangibles (Tables)
 6 Months Ended
Jun. 30, 2023
Notes and other explanatory information [abstract]  
Schedule of movements in intangibles
         
  Goodwill Concessions Software Research and development project Total
Balance at December 31, 2022 3,189 6,434 87 528 10,238
Additions - 167 13 3 183
Disposals - (7) - - (7)
Amortization - (123) (21) - (144)
Translation adjustment 151 530 6 44 731
Balance at June 30, 2023 3,340 7,001 85 575 11,001
Cost 3,340 8,601 600 575 13,116
Accumulated amortization - (1,600) (515) - (2,115)
Balance at June 30, 2023 3,340 7,001 85 575 11,001
           
Balance at December 31, 2021 3,208 5,223 86 494 9,011
Additions - 132 17 - 149
Disposals - (9) - - (9)
Amortization - (120) (22) - (142)
Translation adjustment 63 341 2 33 439
Balance at June 30, 2022 3,271 5,567 83 527 9,448
Cost 3,271 6,846 550 527 11,194
Accumulated amortization - (1,279) (467) - (1,746)
Balance at June 30, 2022 3,271 5,567 83 527 9,448