Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,515)	$ 10
Other comprehensive (loss) income, net of tax: Net change in cumulative translation adjustments	(15)	59
Total comprehensive (loss) income	(1,530)	69
Less: Comprehensive income attributable to the noncontrolling interest	1	0
Comprehensive (loss) income, attributable to Aehr Test Systems common shareholders	$ (1,531)	$ 69