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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	May 31, 2014	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011
Current
Federal		$ (133)us-gaap_CurrentFederalTaxExpenseBenefit	$ (1,622)us-gaap_CurrentFederalTaxExpenseBenefit	$ 448us-gaap_CurrentFederalTaxExpenseBenefit
State and local		99	(52)	(19)
Non U.S.		157us-gaap_CurrentForeignTaxExpenseBenefit	468us-gaap_CurrentForeignTaxExpenseBenefit	18us-gaap_CurrentForeignTaxExpenseBenefit
Current, Total		123us-gaap_CurrentIncomeTaxExpenseBenefit	(1,206)us-gaap_CurrentIncomeTaxExpenseBenefit	447us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred		2,951us-gaap_DeferredIncomeTaxExpenseBenefit	830us-gaap_DeferredIncomeTaxExpenseBenefit	(686)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense/(benefit), Total	$ 3,325us-gaap_IncomeTaxExpenseBenefit	$ 3,074us-gaap_IncomeTaxExpenseBenefit	$ (376)us-gaap_IncomeTaxExpenseBenefit	$ (239)us-gaap_IncomeTaxExpenseBenefit	$ 2,559us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.