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14. FINANCIAL INSTRUMENTS (Details Narrative)
€ in Thousands, R$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2019
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
BRL (R$)
Disclosure of detailed information about financial instruments [line items]        
Other operating expenses   R$ 1,667,886   R$ 790,353
Non-derivative financial liabilities [member]        
Disclosure of detailed information about financial instruments [line items]        
Loan contracts with financial institutions | €     € 120,000  
Foreign exchange risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Variations of risk for probable scenarios   Real x Dollar - devaluation of the Real by 1.25% / Real x Euro - devaluation of the Real by 0.14% / Euro x Dollar - appreciation of Euro by 1.20%. Source: Central Bank of Brazil and European Central Bank quotations on 1/14/2021. Real x Dollar - devaluation of the Real by 1.25% / Real x Euro - devaluation of the Real by 0.14% / Euro x Dollar - appreciation of Euro by 1.20%. Source: Central Bank of Brazil and European Central Bank quotations on 1/14/2021.  
Foreign exchange risk [member] | Scenario 1 [member]        
Disclosure of detailed information about financial instruments [line items]        
Percentage of scenarios   25 25  
Foreign exchange risk [member] | Scenario 2 [member]        
Disclosure of detailed information about financial instruments [line items]        
Percentage of scenarios   50 50  
Foreign exchange risk [member] | Cash flow hedges [member]        
Disclosure of detailed information about financial instruments [line items]        
Effect on result recognized in other operational hedging instrument   R$ 790,353    
Foreign exchange risk [member] | Exchange rate swap CDI x dollar [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative exchange rate swap R$ 278,000      
Foreign exchange risk [member] | Exchange rate swap CDI x dollar [member] | UNITED STATES [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative exchange rate swap R$ 67,000