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Income Taxes (Details Textual) - USD ($)	3 Months Ended	5 Months Ended	12 Months Ended
	Feb. 28, 2018	May 31, 2018	May 31, 2018	May 31, 2017	May 31, 2016
Income Taxes (Textual) [Abstract]
Tax benefit due to revaluation of indefinite lived deferred tax liability	$ 9,300,000	$ 9,300,000
Estimated blended corporate income tax rate (as percent)			28.60%
Tax benefit		3,000,000
Foreign subsidiary undistributed earnings		4,900,000	$ 4,900,000	$ 5,300,000
Additional unrecognized tax benefit		500,000	500,000
Accrued interest and penalties		0	0	$ 0	$ 0
Federal
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards after considering limitations of use		157,800,000	157,800,000
Tax Year 2018 To 2023 | Federal
Income Taxes (Textual) [Abstract]
Federal and State net operating loss carryforwards		28,800,000	28,800,000
Tax Year 2027 To 2037 | Federal
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards after considering limitations of use		129,000,000	129,000,000
Tax Year 2018 To 2038 | State
Income Taxes (Textual) [Abstract]
Federal and State net operating loss carryforwards		$ 19,100,000	$ 19,100,000

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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