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Note 24 - Share-based Payments (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2016 BRL (R$) | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |  |  |
Option life, share options granted | [1] | 5 | 5 | 5 |
Weighted average remaining contractual life of outstanding share options |  | 6.27 | 6.4 | 5.96 |
Number of share options outstanding in share-based payment arrangement at end of period |  | 141,328,000 | 135,221,000 | 131,244,000 | 121,770,000
Number of share options vested in share-based payment arrangement |  | 55,538,000 | 40,150,000 |  |
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise |  | R$ 21.83 | R$ 18.87 |  |
Expense from share-based payment transactions with employees |  | 162,700,000 | 236,900,000 | R$ 189,300,000 |
Bottom of range [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Exercise prices of the outstanding options |  | 0.001 | 0.001 | 0.02 |
Top of range [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Exercise prices of the outstanding options |  | R$ 27.43 | R$ 26.09 | R$ 28.32 |
Grant one [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Profit allocation, share-based payments, allocation option one |  | 30.00% |  |  |
Profit allocation, share-based payments, allocation option two |  | 40.00% |  |  |
Profit allocation, share-based payments, allocation option three |  | 60.00% |  |  |
Profit allocation, share-based payments, allocation option four |  | 70.00% |  |  |
Profit allocation, share-based payments, allocation option five |  | 100.00% |  |  |
Option life, share options granted |  | 5 |  |  |
Grant two [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Option life, share options granted |  | 5 |  |  |
Lot A [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Option life, share options granted |  | 5 |  |  |
Lot B [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Option life, share options granted |  | 10 |  |  |
Deferred stock units of Grant One [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Number of other new equity instruments introduced in share-based payment arrangement |  | 426,000 | 794,000 | 7,329,000 |
Fair value of other equity instruments granted in share-based payment arrangement |  | R$ 7,500,000 | R$ 15,200,000 |  |
Share-based payment arrangement, other equity instruments, grace period |  | 5 years |  |  |
Number of other equity instruments granted in share-based payment arrangement |  | 3,429,000 | 2,874,000 | 6,118,000 |
Restricted shares under the share-based plan [Member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Fair value of other equity instruments granted in share-based payment arrangement |  | R$ 239,100,000 |  |  |
Share-based payment arrangement, other equity instruments, grace period |  | 5 years |  |  |
Number of other equity instruments granted in share-based payment arrangement |  | 13,055 |  |  |
[1] | Information based on weighted average plans granted, except for the expected dividends and risk-free interest rate.

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