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23. SHAREHOLDERS' EQUITY (Details 2) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]    
Quantity purchased (in units) 7,409,500  
Amount paid for the shares R$ 58,264 R$ 58,264
Treasury share market price [1] R$ 235,993  
Bottom of range [member]    
Disclosure of classes of share capital [line items]    
Share price R$ 4.48  
Top of range [member]    
Disclosure of classes of share capital [line items]    
Share price 10.07  
Average [member]    
Disclosure of classes of share capital [line items]    
Share price R$ 7.86  
[1] The average share price on December 31, 2020 was used in the amount of R$31.85 per share.