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5. FINANCIAL INVESTMENTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of fair value measurement of assets [line items] |  |
Financial Investments | R$ 895,713 | R$ 735,712
CDB - Bank deposit certificate |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Investments | 882,376 | 716,218
Government securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Investments | R$ 13,337 | R$ 19,494

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