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Income Taxes (Details 4) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Feb. 29, 2016	Feb. 28, 2015	May 31, 2016	May 31, 2015	May 31, 2014	May 31, 2013	May 31, 2012
Reasons for consolidated income tax provision
Effective income tax rate			35.00%				35.00%					35.00%
Income tax (benefit) provision at statutory tax rate of 35%												$ (1,139)	$ (2,845)	$ 1,814
Effect of Graduated tax rates												33	81	(51)
State income taxes, net of Federal tax benefit												(215)	(21)	111
Impact of Non US operations												(162)	133	(27)
Research and development tax credit												(499)	(604)	(236)
Meals and entertainment												329	0	0
Nondeductible interest on contingent payments												262	265	540
Nontaxable gain on revaluation of contingent consideration liability												(170)	(3,102)	(1,734)
Tax law change												0	(454)	1,173
Adjustment to beginning of year valuation allowance												40,685	0	0
Effect of elimination of ASC 718 APIC pool												739	1,253	440
Nondeductible stock-based compensation												0	0	176
Other nondeductible expenses												207	498	384
Overaccrual (underaccrual) of prior year Federal and state taxes												356	38	249
Other												(89)	15	0
Income tax expense/(benefit), Total	$ 351	$ (337)	$ 70	$ 740	$ (7,599)	$ 1,304	$ 812	$ (267)	$ 2,116	$ 84	$ (5,483)	$ 40,337	$ (4,743)	$ 2,839	$ (286)	$ (322)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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