Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (2,027)	$ (2,802)	$ (5,235)
Other comprehensive income (loss), net of tax:
Foreign currency translation income (loss)	160	2	(61)
Reclassification of cumulative translation adjustment as a result of dissolution of Aehr Test System Japan	(2,401)	0	0
Total comprehensive (loss) income	(4,268)	(2,800)	(5,296)
Less: Comprehensive (loss) income attributable to noncontrolling interest	21	(2)	1
Comprehensive (loss) income, attributable to Aehr Test Systems	$ (4,289)	$ (2,798)	$ (5,297)