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Note 27 - Financial Instruments and Risks - Sensitivity Analysis of Financial Instruments (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Total risk exposures [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario R$ 30.4
Sensitivity value level, adverse scenario 321.3
Sensitivity value level, remote scenario 642.7
Fair value of hedges and transactions
Commodities hedge [member] | Commodity risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments (255.7)
Sensitivity value level, probable scenario (335.1)
Sensitivity value level, adverse scenario (858.5)
Sensitivity value level, remote scenario (1,461.2)
Commodities hedge [member] | Input purchase affecting the commodity risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 341.3
Sensitivity value level, adverse scenario 905.0
Sensitivity value level, remote scenario 1,554.2
Fair value of hedging instrument transactions 255.7
Foreign currency exchange hedge [member] | Foreign exchange risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 45.9
Sensitivity value level, probable scenario (125.0)
Sensitivity value level, adverse scenario (2,253.0)
Sensitivity value level, remote scenario (4,552.1)
Foreign currency exchange hedge [member] | Input purchase that affects the foreign exchange risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 125.0
Sensitivity value level, adverse scenario 2,253.0
Sensitivity value level, remote scenario 4,552.1
Fair value of hedging instrument transactions (45.9)
Foreign currency exchange hedge [member] | Foreign currency risk portion of fixed assets exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario (29.7)
Sensitivity value level, adverse scenario (228.1)
Sensitivity value level, remote scenario (450.6)
Fair value of hedging instrument transactions (5.6)
Foreign currency exchange hedge [member] | Capex Purchase affecting the foreign currency exchange risk portion of the fixed assets exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 5.6
Sensitivity value level, probable scenario 29.7
Sensitivity value level, adverse scenario 228.1
Sensitivity value level, remote scenario 450.6
Foreign currency exchange hedge [member] | Total fixed asset exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario
Sensitivity value level, adverse scenario
Sensitivity value level, remote scenario
Fair value of hedges and transactions
Foreign currency exchange hedge [member] | Foreign currency exchange risk portion of expenses exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments (2.8)
Sensitivity value level, probable scenario (10.1)
Sensitivity value level, adverse scenario (81.2)
Sensitivity value level, remote scenario (159.7)
Foreign currency exchange hedge [member] | Expenses that affect the foreign currency exchange risk portion of expenses exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 10.1
Sensitivity value level, adverse scenario 81.2
Sensitivity value level, remote scenario 159.7
Fair value of hedging instrument transactions 2.8
Foreign currency exchange hedge [member] | Total expenses exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario
Sensitivity value level, adverse scenario
Sensitivity value level, remote scenario
Fair value of hedges and transactions
Foreign currency exchange hedge [member] | Foreign currency exchange risk portion of cash exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 0.3
Sensitivity value level, probable scenario 0.3
Sensitivity value level, adverse scenario 0.3
Sensitivity value level, remote scenario 0.3
Foreign currency exchange hedge [member] | Cash transaction affecting the foreign currency exchange risk portion of cash exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario (0.3)
Sensitivity value level, adverse scenario (0.3)
Sensitivity value level, remote scenario (0.3)
Fair value of hedging instrument transactions (0.3)
Foreign currency exchange hedge [member] | Cash transaction affecting the foreign currency exchange risk portion of debt exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 12.8
Sensitivity value level, adverse scenario 168.1
Sensitivity value level, remote scenario 336.2
Fair value of hedging instrument transactions
Commodities and foreign exchange hedges [member] | Total cost exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 6.2
Sensitivity value level, adverse scenario 46.5
Sensitivity value level, remote scenario 93.0
Fair value of hedges and transactions
Interest hedge [member] | Interest rate risk portion of the cash exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 0.1
Sensitivity value level, probable scenario
Sensitivity value level, adverse scenario (1.1)
Sensitivity value level, remote scenario (1.3)
Interest hedge [member] | Interest revenue transaction affecting the interest rate risk portion of the cash exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario
Sensitivity value level, adverse scenario 1.1
Sensitivity value level, remote scenario 1.3
Fair value of hedging instrument transactions (0.1)
Interest hedge [member] | Interest rate risk portion of the debts exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 33.8
Sensitivity value level, probable scenario 31.5
Sensitivity value level, adverse scenario (92.6)
Sensitivity value level, remote scenario (109.1)
Interest hedge [member] | Interest expenses affecting the interest rate portion of the debts exposure portion [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario (31.5)
Sensitivity value level, adverse scenario 92.6
Sensitivity value level, remote scenario 109.1
Fair value of hedging instrument transactions (33.8)
Interest and foreign currency hedges [member] | Total cash exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario
Sensitivity value level, adverse scenario
Sensitivity value level, remote scenario
Fair value of hedges and transactions
Interest and foreign currency hedges [member] | Total debts exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 12.8
Sensitivity value level, adverse scenario 168.1
Sensitivity value level, remote scenario 336.2
Fair value of hedges and transactions
Equity instrument hedges [member] | Stock exchange price risk portion of the equity instrument exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments (242.9)
Sensitivity value level, probable scenario (273.7)
Sensitivity value level, adverse scenario (520.0)
Sensitivity value level, remote scenario (797.1)
Equity instrument hedges [member] | Total equity exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 11.4
Sensitivity value level, adverse scenario 106.7
Sensitivity value level, remote scenario 213.5
Fair value of hedges and transactions
Expenses [member] | Stock exchange price risk portion of the equity instrument exposure [member]  
Statement Line Items [Line Items]  
Sensitivity value level, probable scenario 285.1
Sensitivity value level, adverse scenario 626.7
Sensitivity value level, remote scenario 1,010.6
Fair value of hedging instrument transactions R$ 242.9