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Note 24 - Share-based Payments - Weighted Average Exercise Price of Options (Details) - BRL (R$)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Options outstanding at January 1 st, weighted average exercise price R$ 13.87 R$ 12.36 R$ 10.07
Options issued during the period, weighted average exercise price 19.82 17.18 18.42
Options forfeited during the period, weighted average exercise price 17.88 12.83 20.35
Options exercised during the period, weighted average exercise price 5.81 2.52 5.05
Options outstanding at ended period, weighted average exercise price 15.27 13.87 12.36
Options exercisable at ended period, weighted average exercise price R$ 3.78 R$ 3.66 R$ 3.29