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23. SHAREHOLDERS' EQUITY (Details 1)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
R$ / shares
shares
Disclosure of classes of share capital [line items]  
Authorized quantity 2,400,000,000
Buyback program [member]  
Disclosure of classes of share capital [line items]  
Board's Authorization 04/20/2018
Authorized quantity 30,391,000
Program Period From 4/20/2018 to 4/30/2018
Average buyback price | R$ / shares
Minimum and maximum buyback price | R$
Sale of shares | R$ R$ 22,981,500
Balance in treasury 7,409,500