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LOANS, FINANCING AND DEBENTURES - Fundraising costs (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
LOANS, FINANCING AND DEBENTURES    
Cost R$ 857,174  
Amortization 436,112  
Balance to be amortized 421,062 R$ 385,042
Bonds    
LOANS, FINANCING AND DEBENTURES    
Cost 434,970  
Amortization 173,964  
Balance to be amortized 261,006 238,568
CRA and NCE    
LOANS, FINANCING AND DEBENTURES    
Cost 125,222  
Amortization 103,616  
Balance to be amortized 21,606 32,374
Export credits ("export prepayment")    
LOANS, FINANCING AND DEBENTURES    
Cost 191,710  
Amortization 80,893  
Balance to be amortized 110,817 56,028
Debentures    
LOANS, FINANCING AND DEBENTURES    
Cost 24,467  
Amortization 11,455  
Balance to be amortized 13,012 16,039
BNDES ("IOF")    
LOANS, FINANCING AND DEBENTURES    
Cost 62,658  
Amortization 49,185  
Balance to be amortized 13,473 40,611
Other    
LOANS, FINANCING AND DEBENTURES    
Cost 18,147  
Amortization 16,999  
Balance to be amortized R$ 1,148 R$ 1,422