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Financial instruments and risk management (Details 11 - Textuals 2)
$ in Thousands
Dec. 31, 2021
BRL (R$)
R$ / shares
Dec. 31, 2021
USD ($)
R$ / shares
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Financial instruments and risk management          
Cash and cash equivalents R$ 135,727,000   R$ 162,827,000 R$ 79,500,000 R$ 77,079,000
Financial investments 798,786,000 $ 143,139 0    
NDF          
Financial instruments and risk management          
Purchase and sale agreement for derivative financial instruments, fair value (17,000)   1,321,000    
Zero-cost collar          
Financial instruments and risk management          
Purchase and sale agreement for derivative financial instruments, fair value R$ (25,000)   R$ 2,124,000    
Net premium of contracted derivatives | R$ / shares 0 0      
Revolving credit facility          
Financial instruments and risk management          
Credit facility, maximum borrowing capacity R$ 58,595,000 $ 10,500      
Revolving credit facility | Brazilian real per US dollar          
Financial instruments and risk management          
Exchange rate variation in the year 5.5805