Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 528	$ (5,653)	$ (6,785)
Other comprehensive income, net of tax: Foreign currency translation income	42	13	4
Total comprehensive income (loss)	570	(5,640)	(6,781)
Less: Comprehensive (loss) income attributable to noncontrolling interest	(1)	1	(2)
Comprehensive income (loss), attributable to Aehr Test Systems	$ 571	$ (5,641)	$ (6,779)