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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)