Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,651)	$ (2,975)	$ (4,858)	$ (3,729)
Other comprehensive income (loss), net of tax: Net change in cumulative translation adjustments	2	23	(46)	(19)
Total comprehensive loss	(2,649)	(2,952)	(4,904)	(3,748)
Less: Comprehensive (loss) income attributable to the noncontrolling interest	0	(1)	1	(1)
Comprehensive loss, attributable to Aehr Test Systems common shareholders	$ (2,649)	$ (2,951)	$ (4,905)	$ (3,747)