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Deferred revenue (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of deferred revenue
         
       12.31.23     12.31.22 
Non-current          
Nonrefundable customer contributions                  13,474                11,451
           
Current          
Nonrefundable customer contributions                         50                     137