STOCK-BASED COMPENSATION (Tables)

12 Months Ended

May 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

Compensation based stock option and warrant activity for warrants and qualified and unqualified stock options are summarized as follows:

			Weighted
			Average
	Shares		Exercise Price
Outstanding at May 31, 2006		6,886,652	$	0.64
Granted		5,824,000		0.49
Exercised		(175,604)		0.01
Expired or cancelled		—		—
Outstanding at May 31, 2007		12,535,048		0.58
Granted		5,365,197		0.21
Exercised		—
Expired or cancelled		(2,927,864)		0.22
Outstanding at May 31, 2008		14,972,381		0.51
Granted		14,427,600		0.15 - 0.25
Exercised		—
Expired or cancelled		(9,438,184)		0.25 -1.20
Outstanding at May 31, 2009		19,961,797		0.27
Granted		—
Exercised		(2,228,364)		0.01
Expired or cancelled		(583,197)		0.25
Outstanding at May 31, 2010		17,150,236		0.3
Granted		—
Exercised		(2,227,864)		0.01
Expired or cancelled		(11,072,372)		0.30
Outstanding at May 31, 2011		3,850,000		0.65
Granted		—
Exercised		—
Expired or cancelled		(240,000)		0.83
Outstanding at May 31, 2012		3,610,000		0.55
Granted		—
Exercised		—
Expired or cancelled		(650,000)		0.75
Outstanding at May 31, 2013		2,960,000	$	0.29

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

The following table summarizes information about options outstanding and exercisable at May 31, 2013:

	Options Outstanding and exercisable
	Number Outstanding		Weighted- Average Remaining Life In Years		Weighted- Average Exercise Price		Number Exercisable
Range of exercise prices:
$0.00 - $0.25		1,800,000		2.34		0.24		1,800,000
$0.26 - $1.00		1,160,000		1.32	$	0.36		1,160,000
		2,960,000		1.94	$	0.29		2,960,000

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

The issuance of warrants attributed to debt issuances are summarized as follows:

			Weighted
			Average
	Shares		Exercise Price
Outstanding at May 31, 2006		4,392,874	$	0.84
Granted		4,655,366		0.93
Exercised		0		—
Expired or cancelled		0		—
Outstanding at May 31, 2007		9,048,240		0.88
Granted		1,821,676		0.85
Exercised		0		—
Expired or cancelled		-825,000		0.67
Outstanding at May 31, 2008		10,044,916		0.84
Granted		4,022,225		0.25
Exercised		0		—
Expired or cancelled		-2,332,137		0.85
Outstanding at May 31, 2009		11,735,004		0.63
Granted		0		—
Exercised		0		—
Expired or cancelled		0		—
Outstanding at May 31, 2010		11,735,004		0.63
Granted		0		—
Exercised		0		—
Expired or cancelled		-6,499,057		0.70
Outstanding at May 31, 2011		5,235,945		0.50
Granted		660,000		0.035
Exercised		0		—
Expired or cancelled		0		—
Outstanding at May 31, 2012		5,895,945		0.50
Granted		0		—
Exercised		0		—
Expired or cancelled		-3,545,865		0.70
Outstanding at May 31, 2013		2,350,080	$	0.19

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

The following table summarizes information about warrants outstanding and exercisable at May 31, 2013:

	Outstanding and exercisable
	Number Outstanding		Weighted- average remaining life  in years		Weighted- Average Exercise Price		Number Exercisable
Range of exercise prices:
$.01 to $.25		1,690,080		0.33	$	0.250		1,690,080
$.26 - $.99		660,000		1.00	$	0.035		660,000
		2,350,080						2,350,080