Fair value measurement, Information used for appraisal (Details) - Recurring [Member] - Discounted Cash Flow [Member]	12 Months Ended
Dec. 31, 2020 USD ($)
Offshore Vessels [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 4,504
Average percentage of utilization	78.00%
Discount rate	0.0744
Parcel Tankers [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 15,805
Average percentage of utilization	89.00%
Discount rate	0.0765

The value of significant unobservable input used in the measurement of the fair value of assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_d&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_SignificantUnobservableInputAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant