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Borrowings and financing (Details 1)
R$ in Thousands
Dec. 31, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]  
Amortized cost R$ 1,458,131
Adjustments 34,388
Total 1,492,519
JICA 15 [member]  
IfrsStatementLineItems [Line Items]  
Amortized cost 227,432
Adjustments 2,224
Total 229,656
JICA 18 [member]  
IfrsStatementLineItems [Line Items]  
Amortized cost 204,388
Adjustments (435)
Total 203,953
JICA 17 [member]  
IfrsStatementLineItems [Line Items]  
Amortized cost 124,619
Adjustments 5,011
Total 129,630
JICA 19 [member]  
IfrsStatementLineItems [Line Items]  
Amortized cost 893,329
Adjustments 27,588
Total 920,917
Interest and charges [member]  
IfrsStatementLineItems [Line Items]  
Amortized cost 8,363
Adjustments
Total R$ 8,363