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Note 21 - Changes in Equity - Treasury Shares (Details) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |
Balance, treasury shares acquired/realized (in shares) | 7,500 | 16,600
Balance, treasury shares acquired/realized, amount | R$ (139,700) | R$ (312,700)
Balance, treasury shares (in shares) | (755,300) | (596,000)
Balance, treasury shares, amount | R$ (895,000) | R$ (908,700)
Changes during the year, treasury shares acquired/realized (in shares) | (6,400) | (9,100)
Changes during the year, treasury shares acquired/realized, amount | R$ 118,800 | R$ 173,000
Changes during the year, treasury shares (in shares) | (106,500) | (159,300)
Changes during the year, treasury shares, amount | R$ 12,300 | R$ 13,700
Balance, treasury shares acquired/realized (in shares) | 1,100 | 7,500
Balance, treasury shares acquired/realized, amount | R$ (20,900) | R$ (139,700)
Balance, treasury shares (in shares) | (861,800) | (755,300)
Balance, treasury shares, amount | R$ (882,700) | R$ (895,000)

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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Balance Type: | na
Period Type: | duration

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