Earnings Per Share - Schedule of Calculation of Anti-dilutive Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,033,333	3,333,333	3,333,333	4,033,333
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,000			200,000
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	500,000			500,000
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,333,333	3,333,333	3,333,333	3,333,333