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FINANCIAL INSTRUMENTS - Effectiveness testing for derivatives (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
FINANCIAL INSTRUMENTS      
Current assets R$ 3,246 R$ 0  
Total derivative assets 3,246    
Current liabilities 0 971  
Total derivative liabilities   971  
Net Income      
Gains on financial instruments 28,349 858  
Losses on financial instruments (10,421) (1,632)  
Total gains (losses) on financial instruments 17,928 (774) R$ (15,118)
Other comprehensive income      
Gains (Losses) on financial instruments 1,907 (1,972) R$ 3,502
Total gains (Losses) on financial instruments R$ 1,907 R$ (1,972)