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12 Net finance costs (Tables)
 12 Months Ended
Dec. 31, 2020
Net Finance Costs  
Schedule of net finance costs
  Note   12.31.20   12.31.19   12.31.18
Financial income              
Financial interest     25   75     72
Other interest 35.a   30   3   104
Total financial income     55   78   176
               
Finance costs              
Commercial interest      (5,986)    (4,069)    (6,191)
Interest and other       (3,170)    (5,106)    (4,159)
Fiscal interest     (109)    (7)   (48)
Bank fees and expenses       (11)     (23)   (18)
Total finance costs     (9,276)   (9,205)   (10,416)
               
Other financial results              
Changes in fair value of financial assets       989     383   1,563
Net gain from the repurchase of
Corporate Notes		       415     622     10
Exchange differences      (2,955)    (5,674)    (5,506)
Adjustment to present value of receivables     (129)   (104)    (1)
Recovery of provision for credit RDSA      -    -    -
Other finance costs     (210)     (23)    (180)
Total other finance costs     (1,890)   (4,796)   (4,114)
Total net finance costs     (11,111)   (13,923)   (14,354)