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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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