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Note 1 - Segment Information (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |
Profit (loss) before tax | $ 933,710 | $ 1,103,107 | $ 427,711
Non-current financial assets available-for-sale |  |  | 21,600
Total contract liabilities | $ 82,700 | $ 62,700 | $ 56,700
Tenaris [member] | Government customers [member] |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of entity's revenue | 21.00% | 15.00% | 17.00%
LUXEMBOURG |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of entity's revenue | 0.00% |  |
UNITED STATES |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of entity's revenue | 31.00% |  |
Argentina [member] |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of entity's revenue | 12.00% |  |
Elimination of intersegment amounts [member] |  |  |
Statement Line Items [Line Items] |  |  |
Profit (loss) before tax | $ 36,000 | $ 52,000 | $ 53,000

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