SHARE CAPITAL (Details 1) - Employee Stock Option [Member] - CAD / shares	Feb. 29, 2016	May. 31, 2015	May. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.84	CAD 0.94	CAD 0.84
Number of Options	8,226,334	7,396,334	6,175,234
Exercisable at Period- End	6,678,274	5,627,599
July 29, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.50	CAD 0.50
Number of Options	464,434	464,434
Exercisable at Period- End	464,434	464,434
November 17, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.67	CAD 0.67
Number of Options	210,000	210,000
Exercisable at Period- End	210,000	210,000
January 23, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 1.10	CAD 1.10
Number of Options	50,000	50,000
Exercisable at Period- End	50,000	25,000
May 1, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.73	CAD 0.73
Number of Options	50,000	50,000
Exercisable at Period- End	25,000	25,000
May 29, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.92	CAD 0.92
Number of Options	300,000	300,000
Exercisable at Period- End	300,000	300,000
September 19, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.96	CAD 0.96
Number of Options	2,016,900	2,436,900
Exercisable at Period- End	2,016,900	2,436,900
October 29, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.96	CAD 0.96
Number of Options	100,000	100,000
Exercisable at Period- End	100,000	100,000
August 16, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.76	CAD 0.76
Number of Options	2,120,000	2,420,000
Exercisable at Period- End	2,120,000	1,611,720
September 8, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 1.40	CAD 1.40
Number of Options	1,265,000	1,365,000
Exercisable at Period- End	842,490	454,545
September 9, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.46	CAD 0
Number of Options	640,000	0
Exercisable at Period- End	213,120	0
November 13, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	CAD 0.49	CAD 0
Number of Options	1,010,000	0
Exercisable at Period- End	336,330	0