Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 60	$ (1,452)	$ 70	$ (2,207)
Other comprehensive income (loss), net of tax: Net change in unrealized loss on investments	(3)	0	(3)	0
Net change in cumulative translation adjustments	1	(55)	60	(48)
Total comprehensive income (loss)	58	(1,507)	127	(2,255)
Less: Comprehensive income attributable to the noncontrolling interest	0	2	0	1
Comprehensive income (loss), attributable to Aehr Test Systems common shareholders	$ 58	$ (1,509)	$ 127	$ (2,256)