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Note 13 - Investments in Non-consolidated Companies - Principal Non-consolidated Companies (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Disclosure of unconsolidated structured entities [line items]

Value

$ 957,352

$ 879,965

$ 805,568

Ternium S.A. [member]

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

11.46%

Value

$ 830,000

Ternium S.A. [member] | LUXEMBOURG

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

^[1]

11.46%

11.46%

Value

^[1]

$ 830,028

$ 751,105

Usiminas [member]

Disclosure of unconsolidated structured entities [line items]

Value

$ 65,100

Usiminas [member] | BRAZIL

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

^[2]

3.07%

3.07%

Value

^[2]

$ 65,144

$ 74,593

Techgen s.a. [member]

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

22.00%

Value

$ 19,500

Techgen s.a. [member] | MEXICO

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

22.00%

22.00%

Value

$ 19,536

$ 9,888

Global Pipe Company [Member]

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

35.00%

Value

$ 23,400

Global Pipe Company [Member] | SAUDI ARABIA

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

35.00%

35.00%

Value

$ 23,421

$ 22,550

Other [member]

Disclosure of unconsolidated structured entities [line items]

Percentage of ownership

Value

$ 19,223

$ 21,829

[1]	Including treasury shares.
[2]	At December 31, 2020 and 2019 the voting rights were 5.19%.

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 10
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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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