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Financial instruments by category (Schedule of Fair Value Hierarchy) (Details) - Recurring fair value measurement [member] - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Categories of financial assets [abstract] |  |
Derivative financial assets | $ 1,209 | $ 553
Liabilities |  |
Derivative financial liabilities | 19 | 20,757
Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 242 | 427
Level 1 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 242 | 427
Liabilities |  |
Derivative financial liabilities | 0 | 0
Level 1 of fair value hierarchy [member] | Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 242 | 427
Level 2 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 967 | 126
Liabilities |  |
Derivative financial liabilities | 19 | 20,757
Level 2 of fair value hierarchy [member] | Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 0 | 0
Commodity price risk [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 967 | 126
Liabilities |  |
Derivative financial liabilities | 19 | 20,757
Commodity price risk [member] | Level 1 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 0 | 0
Liabilities |  |
Derivative financial liabilities | 0 | 0
Commodity price risk [member] | Level 2 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 967 | 126
Liabilities |  |
Derivative financial liabilities | $ 19 | $ 20,757

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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