Stockholders' Equity (Details) - Warrants [Member]	9 Months Ended
	Feb. 28, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number	12,317,500
Exercise Price Per Share $0.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.05
Number	1,500,000
Expiry	Feb. 01, 2019
Remaining Life	11 months 5 days
Exercise Price Per Share $0.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.05
Number	3,000,000
Expiry	Aug. 31, 2021
Remaining Life	3 years 6 months 4 days
Exercise Price Per Share $0.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.10
Number	1,500,000
Expiry	Feb. 01, 2019
Remaining Life	11 months 5 days
Exercise Price Per Share $0.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.10
Number	3,000,000
Expiry	Aug. 31, 2021
Remaining Life	3 years 6 months 4 days
Exercise Price Per Share $0.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.15
Number	550,000
Expiry	Jun. 01, 2019
Remaining Life	1 year 3 months
Exercise Price Per Share $0.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.15
Number	125,000
Expiry	Jun. 30, 2019
Remaining Life	1 year 3 months 29 days
Exercise Price Per Share $0.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.20
Number	130,000
Expiry	Jan. 09, 2020
Remaining Life	1 year 10 months 10 days
Exercise Price Per Share $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.25
Number	550,000
Expiry	Jun. 01, 2020
Remaining Life	2 years 3 months 4 days
Exercise Price Per Share $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.25
Number	125,000
Expiry	Jun. 30, 2020
Remaining Life	2 years 4 months 2 days
Exercise Price Per Share $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.25
Number	130,000
Expiry	Jan. 09, 2020
Remaining Life	1 year 10 months 10 days
Exercise Price Per Share $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.25
Number	135,000
Expiry	Feb. 17, 2020
Remaining Life	1 year 11 months 19 days
Exercise Price Per Share $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.25
Number	140,000
Expiry	May 06, 2020
Remaining Life	2 years 2 months 8 days
Exercise Price Per Share $0.30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.30
Number	135,000
Expiry	Feb. 17, 2020
Remaining Life	1 year 11 months 19 days
Exercise Price Per Share $0.30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.30
Number	140,000
Expiry	May 06, 2020
Remaining Life	2 years 2 months 8 days
Exercise Price Per Share $0.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.35
Number	65,000
Expiry	Aug. 07, 2020
Remaining Life	2 years 5 months 8 days
Exercise Price Per Share $0.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.35
Number	75,000
Expiry	Oct. 16, 2020
Remaining Life	2 years 7 months 17 days
Exercise Price Per Share $0.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.35
Number	267,500
Expiry	Nov. 16, 2020
Remaining Life	2 years 8 months 19 days
Exercise Price Per Share $0.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.40
Number	65,000
Expiry	Aug. 07, 2020
Remaining Life	2 years 5 months 8 days
Exercise Price Per Share $0.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.40
Number	75,000
Expiry	Oct. 16, 2020
Remaining Life	2 years 7 months 17 days
Exercise Price Per Share $0.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.40
Number	267,500
Expiry	Nov. 16, 2020
Remaining Life	2 years 8 months 19 days
Exercise Price Per Share $0.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.45
Number	75,000
Expiry	Oct. 16, 2020
Remaining Life	2 years 7 months 17 days
Exercise Price Per Share $0.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.45
Number	267,500
Expiry	Nov. 16, 2020
Remaining Life	2 years 8 months 19 days