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Note 24 - Share-based Payments - Weighted Average Exercise Price of Options (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Options outstanding at January 1 st, weighted average exercise price R$ 15.27 R$ 13.87 R$ 12.36
Options issued during the period, weighted average exercise price 18.04 19.82 17.18
Options forfeited during the period, weighted average exercise price 18.55 17.88 12.83
Options exercised during the period, weighted average exercise price 7.47 5.81 2.52
Options outstanding at ended period, weighted average exercise price 16.16 15.27 13.87
Options exercisable at ended period, weighted average exercise price R$ 2.25 R$ 3.78 R$ 3.66