Stock Options - Schedule of Option Activity (Details) - USD ($)	12 Months Ended
	May 31, 2018	May 31, 2017
Stock Options
Number of options outstanding, beginning balance	200,000	675,000
Number of options exercised		(475,000)
Number of options outstanding, ending balance		200,000
Number of options exercisable	200,000
Number of options non-vested	0
Weighted average exercise price outstanding, beginning balance	$ 0.12	$ 0.12
Weighted average exercise price, exercised		0.12
Weighted average exercise price outstanding, ending balance		0.12
Weighted average exercise price, exercisable	$ 0.12
Remaining contractual life (years) outstanding	4 years	0 years
Remaining contractual life (years), exercisable	4 years	0 years
Intrinsic value, options exercisable	$ 54,000