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6. TRADE ACCOUNTS RECEIVABLE AND OTHER RECEIVABLES (Details 1) - Notes Receivables [Member] - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in allowance account for credit losses of financial assets    
Beginning balance R$ (503,848) R$ (508,848)
(Additions) Reversals (12,137) (23,899)
Write-offs 19,451 44,039
Exchange rate variation (109,406) (15,140)
Ending balance R$ (605,940) R$ (503,848)