SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

May 31, 2016

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, 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
Options granted	345,000	$1.04-$1.20	$1.17
Options exercised	(269,625)	$0.38-$0.84	$0.41
Options canceled or expired	(24,375)	$0.43-$1.04	$0.74
Options outstanding at May 31, 2016	1,199,000	$0.43-$1.20	$0.81

Schedule of Nonvested Share Activity [Table Text Block]

		STOCK OPTIONS WEIGHTED AVERAGE AVERAGE GRANT DATE FAIR VALUE
	NUMBER OF SHARES
Nonvested shares at May 31,2015	527,125	$	0.75
Granted	345,000	$	1.17
Vested/Issued	(179,250)	$	0.66
Forfeited	(19,625)	$	0.77
Nonvested shares at May 31,2016	673,250	$	0.99

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

		WEIGHTED  AVERAGE  REMAINING  CONTRACTUAL LIFE IN YEARS
			WEIGHTED  AVERAGE EXERCISE  PRICE	NUMBER  EXERCISABLE AT MAY 31, 2016
	NUMBER  OUTSTANDING 05/31/2016				WEIGHTED  AVERAGE EXERCISE PRICE
RANGE OF EXERCISE PRICES
$0.43	311,750	0.61	$0.43	311,750	$0.43
$ 0.71 - $ 0.85	545,250	4.23	$0.79	214,000	$0.76
$ 1.04 - $ 1.20	342,000	8.59	$1.17	--	--