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19. Provisions (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
SummaryOfProvisionsLineItems [Line Items] |  |
Lawsuits filed by commercial customers | 1,070 | 1,140
Lawsuits which customers claim a reduction in the sewage tariff | 680 | 710
Lawsuits which customers plead reduction in tariff | 50 | 50
Tax claims related to income tax and social contribution | R$ 52,192 | R$ 50,023
Tax deficiency notice related to sewage services | 547,510 | 501,060
Offset requests for the extinction of IRPJ/CSLL payable | 42,173 | 62,039
Request for an authorization to offset taxes | 51,374 | 49,682
Tax adjustment rejected | 11,862,000 |
Request to offset tax credits related to IRPJ and CSLL - contingent liabilities | 8,296 | 8,010
Request to offset tax credits related to IRPJ and CSLL - accrued | 1,415 | 1,366
Lawsuits related to taxes and fines - accrued | 40,123 | 39,495
Lawsuits related to taxes and fines - contingent liabilities | 582,168 | 466,407
Intangible assets related to the municipalities | 28,417 | 28,273
Indemnities receivable | 24,071 |
Increase in lawsuits deemed as contingent liabilities | 561,400 |
Legal and administrative agreements | 41,133 |
Legal and administrative agreements related to construction | 19,077 |
Legal and administrative agreements related to environmental indemnifications | 22,056 |
Environmental indemnifications | 43,014 | 20,626
Guarantee insurance for escrow deposit | 101,192 | 134,377
Renewed guarantee insurance | 500,000 |
Brazilian Federal Revenue Service |  |
SummaryOfProvisionsLineItems [Line Items] |  |
Tax adjustment rejected | 56,118 | 8,659
IRPJ/CSLL |  |
SummaryOfProvisionsLineItems [Line Items] |  |
Tax adjustment rejected | R$ 11,164 | R$ 698

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