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7 Trade Accounts Receivable (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [line items]    
Trade receivables R$ 3,182,567 R$ 3,107,006
Bottom Of Range [Member]    
Disclosure of subsidiaries [line items]    
Discount rate for trade account receivables 0.26%  
Top Of Range [Member]    
Disclosure of subsidiaries [line items]    
Discount rate for trade account receivables 2.81%  
CCEE [Member]    
Disclosure of subsidiaries [line items]    
Trade receivables R$ 119,665