SUMMARIZES OPTION ACTIVITY UNDER 2011 STOCK OPTION PLAN (Details) {Stockholders'Equity}	6 Months Ended
	Nov. 30, 2015 shares
Number of Options
Outstanding options	129,500
Options Granted	30,000
Options Exercised	0
Options Forfeited or expired	(12,500)
Outstanding options	147,000
Options Granted	2,500
Options Exercised	0
Options Forfeited or expired	0
Outstanding options	149,500
Options Exercisable	114,867
Weighted Average Exercise Price Per Share
Outstanding options	1.88
Options Granted	1.84
Options Forfeited or expired	1.11
Outstanding options	1.77
Outstanding options	1.75
Options Exercisable	1.77
Weighted-Average Remaining Life (in years)
Outstanding options	9.74
Options Granted	10.00
Outstanding options	8.54
Outstanding options	8.07
Options Exercisable	7.92
Aggregate Intrinsic Value
Outstanding options	20,825
Outstanding options	2,625
Outstanding options	5,625
Options Exercisable	5,063