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11. Investments (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfAssociatesLineItems [Line Items]      
Associates, beginning R$ 22,731 R$ 21,537 R$ 13,143
Capital increase     10,368
Dividends (1,264) (948) (5,377)
Share of profit (loss) of associates 3,874 2,142 3,403
Associates, ending 25,341 22,731 21,537
Transportadora Sulbrasileira de Gas      
SummaryOfAssociatesLineItems [Line Items]      
Associates, beginning 6,001 5,743 6,212
Capital increase     0
Dividends (865) (948) (1,924)
Share of profit (loss) of associates 1,212 1,206 1,455
Associates, ending 6,348 6,001 5,743
Oxicap Industria de Gases      
SummaryOfAssociatesLineItems [Line Items]      
Associates, beginning 12,981 12,000 3,090
Capital increase     10,368
Dividends 0 0 (3,453)
Share of profit (loss) of associates 1,477 981 1,995
Associates, ending 14,458 12,981 12,000
Quimica da Bahia Industria e Comercio      
SummaryOfAssociatesLineItems [Line Items]      
Associates, beginning 3,678 3,684 3,676
Capital increase     0
Dividends 0 0 0
Share of profit (loss) of associates (60) (6) 8
Associates, ending 3,618 3,678 3,684
Metalurgica Plus      
SummaryOfAssociatesLineItems [Line Items]      
Associates, beginning 71 110 165
Capital increase     0
Dividends 0 0 0
Share of profit (loss) of associates 269 (39) (55)
Associates, ending 340 R$ 71 R$ 110
Plenogas Distribuidora de Gas      
SummaryOfAssociatesLineItems [Line Items]      
Dividends (399)    
Share of profit (loss) of associates 976    
Associates, ending R$ 577