Financial risk management (Narrative) (Details) - USD ($)	12 Months Ended
Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Notes to Financial Statements [Abstract]
Sensitivity analysis, variance, percentage	10.00%
Value at risk	$ 158,836	$ 421,748	$ 327,170

The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 41
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_41&doctype=Standard
-URIDate 2018-03-16

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant