Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (6,647)	$ 422	$ (3,419)
Other comprehensive (loss) income, net of tax: Foreign currency translation (loss) income	(254)	45	(14)
Total comprehensive (loss) income	(6,901)	467	(3,433)
Less: Comprehensive income (loss) attributable to noncontrolling interest	3	(1)	2
Comprehensive (loss) income, attributable to Aehr Test Systems	$ (6,904)	$ 468	$ (3,435)