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Note 38 - Nationalization of Venezuelan Subsidiaries (Details Textual) - USD ($) $ in Thousands				12 Months Ended
	Jul. 17, 2020	Dec. 12, 2016	Jan. 29, 2016	Dec. 31, 2020	Dec. 31, 2019
Disclosure of subsidiaries [line items]
Nationalization of subsidiaries, compensation award post-award interest				$ 83,400
Total trade and other non-current receivables				154,303	$ 157,103
VENEZUELA
Disclosure of subsidiaries [line items]
Total trade and other non-current receivables				48,700
Matesi Materiales Siderúrgicos S.A [member] | VENEZUELA
Disclosure of subsidiaries [line items]
Nationalization of subsidiaries, compensation award not including pre-award interest			$ 87,300
Nationalization of subsidiaries, pre-award interest			85,500
Nationalization of subsidiaries, compensation award including pre-award interest			$ 172,800
Nationalization of subsidiaries, post-award interest rate			9.00%
Nationalization of subsidiaries, compensation award including including principal and post-award interest	$ 256,200
Tavsa and Comsigua [member] | VENEZUELA
Disclosure of subsidiaries [line items]
Nationalization of subsidiaries, compensation award including pre-award interest		$ 137,000
Nationalization of subsidiaries, reimbursement of legal fees		$ 3,300
Nationalization of subsidiaries, basis spread on variable rate		4.00%
Interest receivable				$ 132,400

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The amount of interest recognised as a receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
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- Definition

The amount of non-current trade receivables and non-current other receivables. [Refer: Non-current trade receivables; Other non-current receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph h
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Percentage points added to the reference rate to compute the variable rate on the interest receivable associated with the nationalization of subsidiaries.

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The amount awarded, including pre-award interest, as compensation for the nationalization of subsidiaries.

+ References

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The amount awarded, including principal and post-award interest, as compensation for the nationalization of subsidiaries.

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The amount awarded, not including pre-award interest, as compensation for the nationalization of subsidiaries.

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The amount of post-award interest for compensation for the nationalization of subsidiaries.

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The rate at which interest will accrue if compensation for the nationalization of subsidiaries is not received by the due date.

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The amount of pre-award interest associated with compensation for the nationalization of subsidiaries.

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The amount of reimbursement of legal fees associated with the nationalization of subsidiaries.

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