XML 92 R53.htm IDEA: XBRL DOCUMENT v3.21.1
2 Significant accounting policies (Details Narrative)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SignificantAccountingPoliciesLineItems [Line Items]      
Tax rate 34.00% 34.00% 34.00%
Lease term 1 year 1 year  
Teaching activities [member] | Program of social integration ("pis") [member]      
SignificantAccountingPoliciesLineItems [Line Items]      
Tax rate 0.65%    
Teaching activities [member] | Contribution for the financing of social security ("COFINS") [member]      
SignificantAccountingPoliciesLineItems [Line Items]      
Tax rate 3.00%    
Non-teaching activities [member] | Program of social integration ("pis") [member]      
SignificantAccountingPoliciesLineItems [Line Items]      
Tax rate 1.65%    
Non-teaching activities [member] | Contribution for the financing of social security ("COFINS") [member]      
SignificantAccountingPoliciesLineItems [Line Items]      
Tax rate 7.60%