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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Reconciliation of the weighted-average number of common shares
Basic	35,135,689us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	34,817,279us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	25,382,293us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities	304,161us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted	35,439,850us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	34,817,279us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	25,382,293us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6528421

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