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Note 25 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Details Textual) R$ / shares in Units, $ in Thousands, € in Millions, R$ in Millions, $ in Billions |  |  |  | 1 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2017 USD ($) | Dec. 21, 2017 EUR (€) | Jun. 30, 2017 USD ($) | Sep. 01, 2013 R$ / shares shares | Nov. 30, 2017 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$) | Aug. 31, 2017 USD ($) | Aug. 31, 2017 MXN ($) | Jul. 07, 2016 USD ($) | Jan. 31, 2016 USD ($) | Jan. 31, 2016 EUR (€) | Jan. 22, 2016 USD ($) | Feb. 28, 2014 USD ($) | Feb. 28, 2014 EUR (€) | Dec. 24, 2013 USD ($) | Dec. 24, 2013 EUR (€) | Dec. 24, 2012 USD ($) | Dec. 24, 2012 EUR (€)
Equity in accordance with Luxembourg law [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributable retained earnings |  |  |  |  |  | $ 17,566,494 | $ 17,566,494 |  |  |  |  |  |  |  |  |  |  |  |  |
Techgen s.a. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of supply contract |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of corporate guarantee covering obligations |  |  |  |  |  | 22.00% | 22.00% | 22.00% |  |  |  |  |  |  |  |  |  |  |  |
Voest Alpine Grobblech Gmb [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitments |  |  |  |  |  | $ 137,000 | $ 137,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Transportadora de Gas del Norte S.A. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitments |  |  |  |  |  | $ 77,500 | 77,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Term of supply contract |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Praxair S.A. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitments |  |  |  |  |  | $ 43,900 | 43,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Term of supply contract |  |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Graftech [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitments |  |  |  |  |  | $ 78,300 | 78,300 |  |  |  |  |  |  |  |  |  |  |  |  |
DALMINE S.p.A. [member] | Italian tax authorities [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000 | € 9.0 | $ 271,000 | € 226.0 | $ 357,000 | € 298.0
Bank acceptance liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 210,000 | € 175.0 |  |  |  |  |  |  |
Aggregate cash payments for legal settlements | $ 51,000 | € 42.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments during legal proceedings | 4,000 | € 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess amount provisioned for estimated financial effect of contingent liabilities | $ 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  | 40,500 | 40,500 | R$ 133.9 |  |  |  |  |  |  |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, percentage |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests | R$ / shares |  |  |  | R$ 28.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, shares | shares |  |  |  | 182,609,851 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, contingent liability |  |  |  | 17.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Itaú Seguros S.A. [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  | 24,800 | 24,800 | 81.9 |  |  |  |  |  |  |  |  |  |  |  |
Estimated percentage of lost profits |  |  |  |  | 54.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Veracel Celulose S.A. [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  | $ 15,700 | $ 15,700 | R$ 52.0 |  |  |  |  |  |  |  |  |  |  |  |
TENARIS GLOBAL SERVICES S.A. and subsidiaries [member] | Petroamazonas [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500 |  |  |  |  |  |
TENARIS BAY CITY, INC. [member] | Contractor [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total excess cost of project |  |  | $ 77,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SIDERCA S.A.I.C. and subsidiaries [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of alleged inaccurate currency exchange declarations |  |  |  |  |  | 15 | 15 | 15 |  |  |  |  |  |  |  |  |  |  |  |
Amount alleged inaccurate for the export of goods |  |  |  |  |  | $ 268,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, multiple of fine application possible |  |  |  |  |  | 10 | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |
SIDERCA S.A.I.C. and subsidiaries [member] | Argentine state-owned company [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  | $ 25,400 |  |  |  |  |  |  |  |  |
Tubos de Acero de México S.A and Servicios Generales Tenaris Tamsa S.A. [member] | Mexican tax authorities [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  | $ 91,200 | $ 1.8 |  |  |  |  |  |  |  |  |  |

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