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Stockholders' Equity (Details 1) (USD $) | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Summary of weighted average fair value of options granted |  |  |
Weighted-average fair value of options granted during the year | $ 4.10 | $ 4.19 | $ 5.62

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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