Income taxes - Unused tax assets and liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Book value in excess of tax costs
Deferred tax assets and liabilities
Net deferred tax assets/(liabilities)	$ 262,207	$ 220,302
Property, plant and equipment
Deferred tax assets and liabilities
Net deferred tax assets/(liabilities)	$ (262,207)	$ (220,302)

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_DeferredTaxLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant