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14 Prepaid Expenses (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning R$ 51,281 R$ 73,778  
Amortization (16,434) (22,497)  
Asset value to recover as renegotiation of GSF, ending 34,847 51,281  
Risk premium to be amortized - prepaid expenses 3,180 12,574 R$ 28,033
Grant extension period - intangible 31,667 38,707 R$ 45,745
Risk Premium - Current Asset [Member]      
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning 9,394 15,459  
Amortization (9,394) (15,459)  
Transfers 3,180 9,394  
Asset value to recover as renegotiation of GSF, ending 3,180 9,394  
Risk Premium Noncurrent Asset [Member]      
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning 3,180 12,574  
Transfers (3,180) (9,394)  
Asset value to recover as renegotiation of GSF, ending   3,180  
Intangible [Member]      
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning 38,707 45,745  
Amortization (7,040) (7,038)  
Asset value to recover as renegotiation of GSF, ending R$ 31,667 R$ 38,707