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Note 24 - Share-based Payments - Weighted Average Fair Value of the Options and Assumptions (Details) - BRL (R$)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Statement Line Items [Line Items]

Fair value of options granted

^[1]

R$ 6.51

R$ 6.21

R$ 7.84

Share price

^[1]

19.80

17.18

18.41

Exercise price

^[1]

R$ 19.80

R$ 17.18

R$ 18.41

Expected volatility

^[1]

26.70%

27.00%

27.50%

Vesting year

^[1]

5

5

5

Expected dividends

^[1]

5.00%

5.00%

5.00%

Risk-free interest rate

^[1],[2]

10.10%

12.40%

15.90%

[1]	Information based on weighted average plans granted, except for the expected dividends and risk-free interest rate.
[2]	The percentages include the grants of stock options and ADR's during the period, in which the risk-free interest rate of ADR's are calculated in U.S. dollar.

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The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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