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Note 12 - Investments in Non-consolidated Companies - Principal Non-consolidated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 640,294 | $ 557,031 | $ 490,645
Ternium s.a. [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership |  | 11.46% |  |
Value |  | $ 563,700 |  |
Ternium s.a. [member] | LUXEMBOURG |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership | [1] | 11.46% | 11.46% |
Value | [1] | $ 563,735 | $ 491,285 |
Usiminas [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 70,600 |  |
Usiminas [member] | BRAZIL |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Percentage of ownership | [2] | 3.08% | 3.08% |
Value | [2] | $ 70,642 | $ 61,904 |
Other [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Value |  | $ 5,917 | $ 3,842 |
[1] | Including treasury shares.
[2] | At December 31, 2017 and 2016 the voting rights were 5.2%.

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