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3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of changes in accounting estimates [abstract]      
Explanation of changes in applicable tax rates Limited to 30% of the taxable income, applying the rate of 15% plus an additional 10% for the IRPJ and 9% for the CSLL.    
Adoption of IFRS 16   R$ 6,287  
Weighted average rate (12.80%) (22.10%) 13.60%
Weighted average cost of capital 9.80% 11.30%