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Note 24 - Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] |
In R$, except when otherwise indicated |  | 2017 |  | (i) |  | 2016 |  | (i) |  | 2015 |  | (i)
Fair value of options granted |  |  | 6.51 |  |  |  |  | 6.21 |  |  |  |  | 7.84 |  |
Share price |  |  | 19.80 |  |  |  |  | 17.18 |  |  |  |  | 18.41 |  |
Exercise price |  |  | 19.80 |  |  |  |  | 17.18 |  |  |  |  | 18.41 |  |
Expected volatility |  |  | 26.7 | % |  |  |  | 27.0 | % |  |  |  | 27.5 | % |
Vesting year |  |  | 5 |  |  |  |  | 5 |  |  |  |  | 5 |  |
Expected dividends |  |  | 5 | % |  |  |  | 5 | % |  |  |  | 5 | % |
Risk-free interest rate |  |  | 10.1 | % | (ii) |  |  | 12.4 | % | (ii) |  |  | 15.9 | % | (ii)
Disclosure of the number of share options [text block] |
Thousand options |  | 2017 |  |  | 2016 |  |  | 2015 |
Options outstanding at January 1 st |  |  | 131,244 |  |  |  | 121,770 |  |  |  | 126,149 |
Options issued during the period |  |  | 20,435 |  |  |  | 24,806 |  |  |  | 16,568 |
Options exercised during the period |  |  | (13,548 | ) |  |  | (11,613 | ) |  |  | (19,975 | )
Options forfeited during the period |  |  | (2,910 | ) |  |  | (3,719 | ) |  |  | (972 | )
Options outstanding at ended year |  |  | 135,221 |  |  |  | 131,244 |  |  |  | 121,770 |
Disclosure of weighted average exercise prices of share options [text block] |
In R$ per share |  | 2017 |  |  | 2016 |  |  | 2015 |
Options outstanding at January 1 st |  |  | 13.87 |  |  |  | 12.36 |  |  |  | 10.07 |
Options issued during the period |  |  | 19.82 |  |  |  | 17.18 |  |  |  | 18.42 |
Options forfeited during the period |  |  | 17.88 |  |  |  | 12.83 |  |  |  | 20.35 |
Options exercised during the period |  |  | 5.81 |  |  |  | 2.52 |  |  |  | 5.05 |
Options outstanding at ended period |  |  | 15.27 |  |  |  | 13.87 |  |  |  | 12.36 |
Options exercisable at ended period |  |  | 3.78 |  |  |  | 3.66 |  |  |  | 3.29 |
Disclosure of number and weighted average exercise prices of other equity instruments [text block] |
Thousand deferred shares |  | 2017 |  |  | 2016 |  |  | 2015 |
Deferred shares outstanding at January 1 st |  |  | 19,260 |  |  |  | 19,056 |  |  |  | 17,490 |
New deferred shares during the period |  |  | 794 |  |  |  | 7,329 |  |  |  | 2,692 |
Deferred shares granted during the period |  |  | (2,874 | ) |  |  | (6,118 | ) |  |  | (804 | )
Deferred shares forfeited during the period |  |  | (880 | ) |  |  | (1,007 | ) |  |  | (322 | )
Deferred shares outstanding at ended year |  |  | 16,300 |  |  |  | 19,260 |  |  |  | 19,056 |

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