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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)