Note 5 - Share Capital - Allocation of Stock-based Compensation Expenses (Details) - CAD ($)	9 Months Ended
Feb. 28, 2019	Feb. 28, 2018
Share-based Compensation	$ 962,148	$ 508,865
Consulting fees [Member]
Share-based Compensation	423,134	231,065
Exploration expenditures - Geological/geophysical [Member]
Share-based Compensation	85,090	41,166
Investor relations [Member]
Share-based Compensation	130,676	69,817
Professional Fees [Member]
Share-based Compensation	7,533	5,511
Wages and Benefits [Member]
Share-based Compensation	$ 315,715	$ 161,306

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration