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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2014	May 31, 2014	May 31, 2013	May 31, 2012
Reasons for consolidated income tax provision
Income tax (benefit) provision	$ 176	$ 3,292	$ (31)	$ (188)
Effect of Graduated tax rates		64	(6)	(53)
State income taxes, net of Federal tax benefit		(122)	(88)	(158)
State income tax credits, net of Federal tax benefit		0	23	69
Impact of Non US operations		27	228	(46)
Tax-exempt interest		0	2	4
Research and development tax credit		236	142	115
Domestic Production Activities deduction		0	0	71
Nondeductible acquisition costs		0	(110)	(1,144)
Nondeductible interest on contingent payments		(540)	(130)	0
Nontaxable gain on revaluation of contingent consideration liability		1,698	0	0
Tax law change		(1,173)	0	0
Effect of elimination of ASC 718 APIC pool		(440)	0	0
Nondeductible stock-based compensation		(176)	(108)	(125)
Other nondeductible expenses		(384)	(336)	(336)
Overaccrual (underaccrual) of prior year Federal and state taxes		(249)	10	138
Fully reserved capital losses		0	179	(208)
Other		0	0	12
Income tax (benefit) provision at statutory tax rate of 35%		$ 2,233	$ (225)	$ (1,849)

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