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14 Prepaid Expenses (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning R$ 34,847 R$ 24,628  
Amortization (10,219) (16,434)  
Transfers    
Asset value to recover as renegotiation of GSF, ending 24,628 34,847  
Risk premium to be amortized - prepaid expenses 3,180 R$ 12,574
Grant extension period - intangible 24,628 31,667 R$ 38,707
Intangible [member]      
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning 31,667 38,707  
Amortization (7,039) (7,040)  
Transfers    
Asset value to recover as renegotiation of GSF, ending 24,628 31,667  
Risk Premium - Current Asset [member]      
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF, beginning 3,180 (3,180)  
Amortization (3,180) (9,394)  
Transfers   3,180  
Asset value to recover as renegotiation of GSF, ending 3,180  
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  
Amortization  
Transfers   (3,180)  
Asset value to recover as renegotiation of GSF, ending