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Note 8 - Income Tax (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2019
Statement Line Items [Line Items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss |  |  |  |  |  | $ 400,314 |
Deferred tax expense (income) relating to origination and reversal of temporary differences | $ (45,000) |  |  |  |  |  |
ARGENTINA |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 35.00% |  |  |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  |  |  | $ (46,000) |  |  |
ARGENTINA | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  | 25.00% |  |  |  |  | 30.00%
UNITED STATES |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 35.00% |  |  |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  |  |  | $ (15,200) |  |  |
UNITED STATES | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  | 21.00% |  |  |  |
Welded pipe assets [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss |  |  |  | $ 0 | $ 0 | $ 400,300 |

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