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8. INVESTMENTS (Details Narrative) - BRL (R$) R$ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2019 | May 31, 2019 | May 13, 2019 | Feb. 28, 2018 | Nov. 30, 2015 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 29, 2018
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  | R$ 1,466,219 |  |  |
Percent of total shares |  |  |  |  |  |  | 100.00% | 100.00% |  |
Fair value of investment properties |  |  |  |  |  |  | R$ 1,700 |  |  |
Panatlantica S. A. ("Panatlantica") [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 11.31% | 11.33% |  |
Heartland Steel Processing, LLC [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Transaction price |  |  |  |  |  |  |  |  |  | R$ 400,000
Ita Energetica [Member] | Joint Operation [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 48.75% | 48.75% |  |
Class B Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Transfer of shares |  |  | 501,789 |  |  |  |  |  |  |
Class B Preferred Shares [Member] | Northeast Investment Fund - FINOR [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Transfer of shares |  |  | 1,677,816 |  |  |  |  |  |  |
Preferred Shares (USIM5) [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  | 3,136,100 |  |  |  |  |
Number of preferred shares issued, value |  |  |  |  | R$ 39,377 |  |  |  |  |
Common Shares [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 15.19% |  |  |
Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  |  | 20.29% |  |
FTL - Ferrovia Transnordestina Logistica S.A. ("FTL") [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Change in equity of subsidiaries |  |  |  | R$ 27,670 |  |  |  |  |  |
Percentage of ownership interesr previously held |  |  |  | 91.69% |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 92.38% |  |  |  |  |  |
loss from acquisition of ownership interest |  |  |  | R$ 293 |  |  |  |  |  |
Csn Mineracao S.A. ("CSN Mineracao") [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  | 87.52% | 17.92% |  |  |
Transnordestina Logistica S.A [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Loss from joint venture |  |  |  |  |  |  | R$ 659,105 | R$ 387,989 |  |
Number of shares acquire |  |  |  |  |  |  |  |  | 2,912,997 |
Number of shares acquire, value |  |  |  |  |  |  |  |  | R$ 153,253 |
Percentage of diluted shares |  |  |  |  |  |  |  |  | 46.30% |
Gain on diluted shares |  |  |  |  |  |  |  |  | R$ 2,814 |
Percent of total shares |  |  |  |  |  |  | 92.60% |  |  |
Percent of voting capital |  |  |  |  |  |  | 47.26% |  |  |
CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of ownership interesr previously held |  | 50.00% |  |  |  |  |  |  |  |
Percentage of ownership interest |  | 100.00% |  |  |  |  |  |  |  |
Amount paid on the acquisition of CBSI | [1] | R$ 24,000 |  |  |  |  |  |  |  |
Number of shares acquire |  | 1,875,146 |  |  |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Igarapava [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | R$ 22,441 | 23,596 |  |
Expenses |  |  |  |  |  |  | R$ 6,497 | R$ 582 |  |
Joint Venture [Member] | MRS Logistica [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 34.94% | 34.94% |  |
Joint Venture [Member] | Transnordestina Logistica [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 47.26% | 46.30% |  |
Joint Venture [Member] | CBSI [Member] |  |  |  |  |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  |  |  |  |  | 50.00% | 50.00% |  |
[1] | Total amount paid for another 50% of the CBSI company.

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