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14 Prepaid Expenses (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Prepaid expenses R$ 33,695 R$ 44,109
Prepaid expenses, current 33,563 40,819
Prepaid expenses, noncurrent 132 3,290
Risk Premium - GSF Renegotiation [Member]    
Disclosure of fair value measurement of assets [line items]    
Prepaid expenses 3,180 12,574
Others [Member]    
Disclosure of fair value measurement of assets [line items]    
Prepaid expenses R$ 30,515 R$ 31,535