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20. Provisions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Provisions Details Narrative Abstract    
Lawsuits filed by commercial customers 890 1,070
Lawsuits which customers claim a reduction in the sewage tariff 490 680
Lawsuits which customers plead reduction in tariff 40 50
Tax claims related to income tax and social contribution R$ 53,430 R$ 52,192
Tax deficiency notice related to sewage services 605,008 547,510
Offset requests for the extinction of IRPJ/CSLL payable 36,070 42,173
Request for an authorization to offset taxes 52,427 51,374
Lawsuits related to taxes and fines - accrued 17,682 40,123
Lawsuits related to taxes and fines - contingent liabilities 677,786 582,168
Intangible assets related to the municipalities 114,335 114,335
Indemnities receivable 109,990  
Increase in lawsuits deemed as contingent liabilities 464,800  
Legal and administrative agreements 48,353  
Legal and administrative agreements related to construction 46,538  
Legal and administrative agreements related to environmental indemnifications 1,835  
Environmental indemnifications 44,828 43,014
Guarantee insurance for escrow deposit 160,377 R$ 101,192
Renewed guarantee insurance R$ 500,000