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7 Trade Accounts Receivable (Details Narrative)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of subsidiaries [line items]  
Total amount presented of controversial portion of colider HPP R$ 119,665
Bottom Of Range [member]  
Disclosure of subsidiaries [line items]  
Discount rate for trade account receivables 0.49%
Top Of Range [member]  
Disclosure of subsidiaries [line items]  
Discount rate for trade account receivables 2.89%