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12. Investments (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 15,000,000 | R$ 10,000,000 |
Capital stock, shares | 683,509,869 |  |
Shares issued | 683,509,869 | 683,509,869 | 683,509,869
Sesamm |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 19,532 |  |
Capital stock, shares | 19,532,409 |  |
Equity interest | 36.00% | 36.00% | 36.00%
Aguas de Andradina |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 17,948 |  |
Capital stock, shares | 17,936,174 |  |
Equity interest | 30.00% | 30.00% | 30.00%
Aguas de Castilho |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 2,785 |  |
Capital stock, shares | 2,785,225 |  |
Equity interest | 30.00% | 30.00% | 30.00%
Saneaqua Mairinque |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 4,183 |  |
Capital stock, shares | 3,141,239 |  |
Equity interest | 30.00% | 30.00% | 30.00%
Attend Ambiental |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 13,400 |  |
Capital stock, shares | 13,400,000 |  |
Equity interest | 45.00% | 45.00% | 45.00%
Aquapolo Ambiental |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 36,412 |  |
Capital stock, shares | 42,419,045 |  |
Equity interest | 49.00% | 49.00% | 49.00%
Paulista Geradora de Energia |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital stock | R$ 8,679 |  |
Capital stock, shares | 8,679,040 |  |
Equity interest | 25.00% | 25.00% | 25.00%
Annual and Extraordinary Shareholders' Meeting |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital increase | R$ 740 |  |
Shares issued | 740 |  |
Minimum mandatory dividends | R$ 184 |  |
Additional dividends | 556 |  |
Annual and Extraordinary Shareholders' Meeting |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Capital increase | R$ 2,290 |  |
Shares issued | 2,289,796 |  |
Minimum mandatory dividends | R$ 573 |  |
Additional dividends | 1,717 |  |
Saneaqua Mairinque |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Advance for future capital increase | R$ 2,183 |  |

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