Stockholders' Equity (Schedule Of Warrants By Excerise Price Range) (Details) - Warrants [Member] | 12 Months Ended |
May 31, 2017$ / sharesshares |
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. 1, 2019 |
Remaining Life | 2 years 2 months 1 day |
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 | 4 years 3 months |
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. 1, 2019 |
Remaining Life | 2 years 2 months 1 day |
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 | 4 years 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 | 550,000 |
Expiry | Jun. 1, 2019 |
Remaining Life | 2 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 | 125,000 |
Expiry | Jun. 30, 2019 |
Remaining Life | 2 years 7 months 2 days |
Exercise Price Per Share $0.2 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.2 |
Number | 130,000 |
Expiry | Jan. 9, 2020 |
Remaining Life | 3 years 1 month 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. 1, 2020 |
Remaining Life | 3 years 6 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 | 3 years 7 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. 9, 2020 |
Remaining Life | 3 years 1 month 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 | 3 years 2 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 6, 2020 |
Remaining Life | 3 years 5 months 8 days |
Exercise Price Per Share $0.3 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.3 |
Number | 135,000 |
Expiry | Feb. 17, 2020 |
Remaining Life | 3 years 2 months 19 days |
Exercise Price Per Share $0.3 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.3 |
Number | 140,000 |
Expiry | May 6, 2020 |
Remaining Life | 3 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 | 65,000 |
Expiry | Aug. 7, 2020 |
Remaining Life | 3 years 8 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 | 3 years 10 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 | 3 years 11 months 16 days |
Exercise Price Per Share $0.4 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.4 |
Number | 65,000 |
Expiry | Aug. 7, 2020 |
Remaining Life | 3 years 8 months 8 days |
Exercise Price Per Share $0.4 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.4 |
Number | 75,000 |
Expiry | Oct. 16, 2020 |
Remaining Life | 3 years 10 months 17 days |
Exercise Price Per Share $0.4 [Member] | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Exercise Price | $ / shares | $ 0.4 |
Number | 267,500 |
Expiry | Nov. 16, 2020 |
Remaining Life | 3 years 11 months 16 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 | 3 years 10 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 | 3 years 11 months 16 days |