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Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Reasons for consolidated income tax provision
Effective income tax rate (as percent)	28.60%	35.00%	35.00%
Income tax (benefit) expense at statutory tax rate of 28.6%, 35.0% and 35.0%, respectively	$ 2,136	$ 3,447	$ (1,139)
Effect of graduated tax rates	0	(98)	33
State income taxes, net of Federal tax benefit	120	(22)	(215)
Impact of Non US operations	(288)	403	(162)
Research and development tax credit	(951)	(403)	(499)
Impact of tax reform	10,912	0	0
Meals and entertainment	242	266	329
Nondeductible interest on contingent payments	0	174	262
Nontaxable gain on revaluation of contingent consideration liability	0	(5,576)	(170)
Change in valuation allowance	(21,741)	6,139	40,685
Effect of elimination of stock compensation APIC pool	0	1,380	739
Nondeductible stock-based compensation	0	(1,224)	0
Other	700	353	474
Income tax (benefit) expense	$ (8,870)	$ 4,839	$ 40,337

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