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Note 21 - Changes in Equity - Treasury Shares (Details) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |
Balance, treasury shares acquired/realized (in shares) | 16,600 | 32,600
Changes during the year, treasury shares acquired/realized (in shares) | (9,100) | (16,000)
Balance, treasury shares acquired/realized (in shares) | 7,500 | 16,600
Balance, treasury shares acquired/realized, amount | R$ (312,700) | R$ (617,500)
Changes during the year, treasury shares acquired/realized, amount | 173,000 | 304,700
Balance, treasury shares acquired/realized, amount | R$ (139,700) | R$ (312,700)
Balance, treasury shares (in shares) | (596,000) | (386,100)
Changes during the year, treasury shares (in shares) | (159,300) | (209,900)
Balance, treasury shares (in shares) | (755,300) | (596,000)
Balance, treasury shares, amount | R$ (908,700) | R$ (1,003,500)
Changes during the year, treasury shares, amount | 13,700 | 94,800
Balance, treasury shares, amount | R$ (895,000) | R$ (908,700)

X
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Period Type: | duration

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- Definition The number of treasury shares acquired/realized during the period. + References No definition available. + Details
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- Definition The value of treasury shares acquired/realized during the period. + References No definition available. + Details
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- Definition The number of treasury shares acquired/realized that are outstanding. + References No definition available. + Details
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- Definition The change in treasury shares during the period. + References No definition available. + Details
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- Definition The value of the changes to treasury shares during the period. + References No definition available. + Details
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- Definition The number of treasury shares held by the entity. + References No definition available. + Details
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Period Type: | instant

X
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