Note 1 - Nature and Continuance of Operations (Details Textual) - CAD ($)					1 Months Ended		12 Months Ended
	Jun. 05, 2019	Dec. 20, 2018	Jun. 07, 2018	Jul. 06, 2017	Apr. 30, 2019	Nov. 30, 2018	May 31, 2019	May 31, 2018
Working Capital							$ 4,204,082	$ 2,562,047
Proceeds from Issuance of Private Placement		$ 2,080,000	$ 4,500,002	$ 4,650,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					615,000	4,036,900	4,651,900	256,660
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price					$ 1.40	$ 0.86	$ 0.93	$ 0.66
Proceeds from Stock Options Exercised					$ 861,000	$ 3,453,924		$ 169,863
Private Placement [Member]
Stock Issued During Period, Shares, New Issues	500,000	800,000	1,730,770	6,200,000
Shares Issued, Price Per Share	$ 1.80	$ 2.60	$ 2.60
Proceeds from Issuance of Private Placement	$ 900,000	$ 2,080,000	$ 4,500,002