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Financial instruments by category (Schedule of Total Financial Assets) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial assets [line items] |  |
Transfers of fair values between level 2 or level 3 during the period for assets or liabilities | $ 0 |
Financial assets at fair value through profit or loss |  |
Financial assets at fair value through profit or loss | 553,000 | $ 1,836,000
Other financial assets at amortized cost |  |
Financial assets at amortised cost | 190,135,000 | 263,630,000
Financial assets | 190,688,000 | 265,466,000
Derivative Financial Instrument Assets [Member] |  |
Financial assets at fair value through profit or loss |  |
Financial assets at fair value through profit or loss | 126,000 | 1,013,000
Cash and cash equivalents [Member] |  |
Financial assets at fair value through profit or loss |  |
Financial assets at fair value through profit or loss | 427,000 | 823,000
Other financial assets at amortized cost |  |
Financial assets at amortised cost | 100,177,000 | 201,084,000
Trade receivables [member] |  |
Other financial assets at amortized cost |  |
Financial assets at amortised cost | 70,531,000 | 46,918,000
Financial assets | 70,531,000 | 46,918,000
To be recovered from co-venturers [Member] |  |
Other financial assets at amortized cost |  |
Financial assets at amortised cost | 4,680,000 | 2,236,000
Other financial assets [Member] |  |
Other financial assets at amortized cost |  |
Financial assets at amortised cost | $ 14,747,000 | $ 13,392,000

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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