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22. RELATED-PARTY BALANCES AND TRANSACTIONS (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of transactions between related parties [line items] |  |
Description of financial investment | Investments in Usiminas shares are R$3,305,109 (R$2,114,620 in December 2019) and cash and cash equivalents with Banco Fibra totaling R$458,494 in December 2020 (R$1,940 in December 2019) and no current amount R$123,409 (R$95,719 in December 2019) from Bonds with an average rate of 98% to 115% of the CDI in the consolidated and holds in the parent company through exclusive funds’ investments in government bonds and CDBs in the amount of R$38,517 on December 31, 2020 (R$8,301 on December 31, 2019). |
Vicunha siderurgia s.a. [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 49.24% |
Rio laco participacoes s.a [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 4.22% |
Distribution of mandatory minimum dividend | R$ 37,997 |
Transnordestina logistica s.a [member] |  |
Disclosure of transactions between related parties [line items] |  |
Loan amount | 962,675 | R$ 844,426
Advance for future capital increase | R$ 664,020 | 428,672
Transnordestina logistica s.a [member] | Bottom of range [member] |  |
Disclosure of transactions between related parties [line items] |  |
Loan interest rate | 125.00% |
Transnordestina logistica s.a [member] | Top of range [member] |  |
Disclosure of transactions between related parties [line items] |  |
Loan interest rate | 130.00% |
MRS logistica [member] |  |
Disclosure of transactions between related parties [line items] |  |
Dividend | R$ 38,088 | R$ 44,554
Vicunha acos s.a [member] |  |
Disclosure of transactions between related parties [line items] |  |
Distribution of mandatory minimum dividend | 443,694 |
Vicunha acos s.a [member] | Bottom of range [member] |  |
Disclosure of transactions between related parties [line items] |  |
Dividend | R$ 204,574 |
Vicunha acos s.a [member] | Vicunha steel s.a. [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 67.93% |
Vicunha acos s.a [member] | CFL participacoes s.a [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 12.82% |
Vicunha acos s.a [member] | Vicunha steel s.a. [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 40.00% |
Rio purus participacoes s.a. [member] | CFL participacoes s.a [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 19.25% |
Rio purus participacoes s.a. [member] | Vicunha steel s.a. [member] |  |
Disclosure of transactions between related parties [line items] |  |
Voting rights | 60.00% |

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