Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 267	$ (2,651)	$ 337	$ (4,858)
Other comprehensive income (loss), net of tax: Net change in unrealized loss on investments	0	0	(3)	0
Net change in cumulative translation adjustments	37	2	97	(46)
Total comprehensive income (loss)	304	(2,649)	431	(4,904)
Less: Comprehensive (loss) income attributable to the noncontrolling interest	(1)	0	(1)	1
Comprehensive income (loss), attributable to Aehr Test Systems common shareholders	$ 305	$ (2,649)	$ 432	$ (4,905)