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8. BIOLOGICAL ASSETS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about biological assets [abstract]      
Depreciation of breeding stock R$ 876,976 R$ 798,239 R$ 784,524
Discount rate used in the valuation 6.00% 7.07%  
Weighted average price used in the valuation of biological assets R$ 34.63 R$ 32.99  
Forests pledged as collateral for financing contingencies R$ 68,381 R$ 62,408