SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

May. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Activity [Table Text Block]

	NUMBER OF STOCK OPTIONS	PRICE RANGE PER SHARE	WEIGHTED AVERAGE EXERCISE  PRICE
Options outstanding at May 31, 2013	846,500	$0.38 - $0.75	$0.47
Options granted	178,000	$0.71-$0.84	$0.75
Options exercised	(69,000)	$0.38-$0.60	$0.51
Options canceled or expired	(95,000)	$0.43-$0.84	$0.59
Options outstanding at May 31, 2014	860,500	$0.38-$0.84	$0.51
Options granted	356,000	$0.82-$0.85	$0.82
Options exercised	(23,000)	$0.38-$0.71	$0.42
Options canceled or expired	(45,500)	$0.43-$0.85	$0.72
Options outstanding at May 31, 2015	1,148,000	$0.38-$0.85	$0.60

Schedule of Nonvested Share Activity [Table Text Block]

		STOCK OPTIONS WEIGHTED AVERAGE AVERAGE GRANT DATE FAIR VALUE
	NUMBER OF SHARES
Nonvested shares at May 31,2014	411,000	$	0.56
Granted	356,000	$	0.82
Vested/Issued	(199,875)	$	0.48
Forfeited	(40,000)	$	0.72
Nonvested shares at May 31,2015	527,125	$	0.75

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

RANGE OF EXERCISE PRICES	NUMBER OUTSTANDING 5/31/2015	WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE IN YEARS	WEIGHTED AVERAGE EXERCISE PRICE	NUMBER EXERCISABLE AT MAY 31, 2015	WEIGHTED AVERAGE EXERCISE PRICE
$ 0.38 - $ 0.50	577,500	1.31	$0.42	509,250	$0.41
$ 0.51 - $ 0.75	184,500	3.65	$0.73	103,875	$0.74
$ 0.82 - $ 0.85	386,000	8.73	$0.82	7,750	$0.83