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Note 12 - Investments in Non-consolidated Companies - Principal Non-consolidated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 879,965 | $ 805,568 | $ 640,294
Ternium S.A. [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership |  | 11.46% |  |
Value |  | $ 751,100 |  |
Ternium S.A. [member] | LUXEMBOURG |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership | [1] | 11.46% | 11.46% |
Value | [1] | $ 751,105 | $ 725,548 |
Usiminas [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 74,600 |  |
Usiminas [member] | BRAZIL |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership | [2] | 3.07% | 3.07% |
Value | [2] | $ 74,593 | $ 72,988 |
Other [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 54,267 | $ 7,032 |
[1] | Including treasury shares.
[2] | At December 31, 2019 and 2018 the voting rights were 5.2%.

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