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SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2014 | May 31, 2012 Price Range Per Share $0.30-$0.75 [Member] | May 31, 2013 Price Range Per Share $0.65-$0.68 [Member] | May 31, 2013 Price Range Per Share $0.30-$0.73 [Member] | May 31, 2013 Price Range Per Share $0.38-$0.73 [Member] | May 31, 2013 Price Range Per Share $0.38-$0.75 [Member] | May 31, 2014 Price Range Per Share $0.71-$0.84 [Member] | May 31, 2014 Price Range Per Share $0.38-$0.60 [Member] | May 31, 2014 Price Range Per Share $0.43-$0.84 [Member] | May 31, 2014 Price Range Per Share $0.38-$0.84 [Member]
SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding at May 31, 2012 |  | 1,004,500 |  |  |  | 846,500 |  |  |  | 860,500
Options outstanding at May 31, 2012 |  | $ 0.46 |  |  |  | $ 0.47 |  |  |  | $ 0.51
Options granted, number of options | 178,000 |  | 30,000 |  |  |  | 178,000 |  |  |
Options granted, weighted average exercise price |  |  | $ 0.67 |  |  |  | $ 0.75 |  |  |
Options exercised, number of options |  |  |  | (122,375) |  |  |  | (69,000) |  |
Options exercised, weighted average exercise price |  |  |  | $ 0.42 |  |  |  | $ 0.51 |  |
Options canceled or expired, number of options |  |  |  |  | (65,625) |  |  |  | (95,000) |
Options canceled or expired, weighted average exercise price |  |  |  |  | $ 0.52 |  |  |  | $ 0.59 |
Options outstanding, number of options |  | 1,004,500 |  |  |  | 846,500 |  |  |  | 860,500
Options outstanding, weighted average exercise price |  | $ 0.46 |  |  |  | $ 0.47 |  |  |  | $ 0.51

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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