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Income Taxes (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Income Taxes (Textual) [Abstract] |  |  |
Potential increase in equity if excess tax benefits are realized | $ 400,000 |  |
Net deferred income tax asset | 21,700,000 |  |
Valuation allowance | (42,209,000) | $ (1,791,000) |
Increase (decrease) valuation allowance | 40,400,000 |  |
Net deferred tax asset before valuation allowance | 19,900,000 |  |
Higher amount of valuation allowance | 20,500,000 |  |
Accrued interest and penalties | 0 | $ 0 | $ 0
Unrecognized tax benefits that would affect the effective tax rate | 100,000 |  |
Additional unrecognized tax benefit | 800,000 |  |
Foreign subsidiary undistributed earnings | 4,600,000 |  |
Federal |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Net operating loss carryforwards after considering limitations of use | 151,700,000 |  |
Tax Year 2017 To 2016 | Federal |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Federal and State net operating loss carryforwards | 29,800,000 |  |
Tax Year 2027 To 2033 | Federal |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Net operating loss carryforwards after considering limitations of use | 121,900,000 |  |
Tax Year 2015 To 2033 | State |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Federal and State net operating loss carryforwards | $ 30,800,000 |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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