Stock Options - Summary of Option Activity (Details) - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of options outstanding, beginning balance	1,150,000	2,100,000
Number of options exercised	(475,000)	(950,000)
Number of options outstanding, ending balance	675,000	1,150,000
Number of options exercisable	150,000
Number of options non-vested	525,000
Weighted average exercise price outstanding, beginning balance	$ 0.12	$ 0.12
Weighted average exercise price, exercised	0.12	0.12
Weighted average exercise price outstanding, ending balance	0.12	$ 0.12
Weighted average exercise price, exercisable	0.12
Weighted average exercise price, non-vested	$ 0.12
Remaining contractual life (years) outstanding	6 years	6 years
Remaining contractual life (years), exercisable	6 years
Remaining contractual life (years), non-vested	6 years
Intrinsic value, options exercisable	$ 21,000
Intrinsic value, options non-vested	$ 73,500