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Income tax and social contribution (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax      
Included in the statement of income R$ 10,278 R$ (20,149)  
Taken directly to equity   3,606  
At December (5,794) (16,074) R$ 469
Tax losses      
Deferred tax      
Included in the statement of income 436 (2,312)  
At December 1,487 1,051 3,363
Tax credit      
Deferred tax      
Included in the statement of income (721)    
Taken directly to equity   3,606  
At December 2,885 3,606  
Technological inovation      
Deferred tax      
Included in the statement of income [1] (16,814) (18,121)  
At December [1] (41,192) (24,378) (6,257)
Other temporary differences—ASSETS      
Deferred tax      
Included in the statement of income 28,995 284  
At December 32,642 R$ 3,647 R$ 3,363
Other temporary differences—LIABILITY      
Deferred tax      
Included in the statement of income (1,616)    
At December R$ (1,616)    
[1] The main temporary differences representing the balance of the deferred tax liability refers to the benefit granted by the Technological Innovation Law (Lei do Bem), which reduces the tax charges on the capitalized amount of property and equipment.