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SHAREHOLDERS' EQUITY (Details) - Stock Options Summary - $ / shares	12 Months Ended
	May. 31, 2015	May. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 0.38	$ 0.38
Range of Exercise Price, Maximum	0.71	$ 0.60
Range Of Exercise Price $0.38 - $0.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	0.38
Range of Exercise Price, Maximum	$ 0.50
Options Outstanding, Number (in Shares)	577,500
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 113 days
Options Outstanding, Weighted Average Exercise Price	$ 0.42
Options Exercisable, Number (in Shares)	509,250
Options Exercisable, Weighted Average Exercise Price	$ 0.41
Range Of Exercise Price $0.51 - $0.75 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	0.51
Range of Exercise Price, Maximum	$ 0.75
Options Outstanding, Number (in Shares)	184,500
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 237 days
Options Outstanding, Weighted Average Exercise Price	$ 0.73
Options Exercisable, Number (in Shares)	103,875
Options Exercisable, Weighted Average Exercise Price	$ 0.74
Range Of Exercise Price $0.82 - $0.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	0.82
Range of Exercise Price, Maximum	$ 0.85
Options Outstanding, Number (in Shares)	386,000
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 266 days
Options Outstanding, Weighted Average Exercise Price	$ 0.82
Options Exercisable, Number (in Shares)	7,750
Options Exercisable, Weighted Average Exercise Price	$ 0.83

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Name Accounting Standards Codification



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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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