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24. Equity (Details Narrative) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Details Narrative Abstract |  |  |  |
Authorized capital | R$ 15,000,000 | R$ 15,000,000 | R$ 15,000,000 |
Minimum mandatory dividend per share and per ADS | R$ .9851 | R$ 0.87539 | R$ 1.0240 |
Additional proposed dividends | R$ 118,859 | R$ 105,543 | R$ 123,557 |
Withholding income tax recognized in current liabilities | 58,258 | 52,004 |  |
Interest on capital balance payable | 673,765 | 598,612 | R$ 700,034 |
Interest on capital balance payable declared | 673,328 | 598,336 |  |
Interest on capital balance payable witheld income tax | 437 | 276 |  |
Investment reserve | 3,840,422 | 6,939,296 |  |
Subscribed and paid-in-capital |  |  | 683,509,869 | 683,509,869
Surplus minimum mandatory | 53,539 |  |  |
Dividends | R$ 792,187 | R$ 703,879 |  |
Dividend per common share | R$ 1.1590 | R$ 1.0298 |  |

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