Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Income Statement [Abstract]
Net sales	$ 1,683	$ 6,874	$ 3,695	$ 12,407
Cost of sales	1,306	3,672	3,091	6,934
Gross profit	377	3,202	604	5,473
Operating expenses:
Selling, general and administrative	1,501	2,157	3,015	3,965
Research and development	820	795	1,720	1,687
Total operating expenses	2,321	2,952	4,735	5,652
(Loss) income from operations	(1,944)	250	(4,131)	(179)
Interest (expense) income, net	(12)	2	(25)	14
Net gain from dissolution of Aehr Test Systems Japan	0	0	2,186	0
Other (expense) income, net	(6)	5	(100)	15
(Loss) income before income tax (expense) benefit	(1,962)	257	(2,070)	(150)
Income tax (expense) benefit	(4)	(6)	211	(12)
Net (loss) income	$ (1,966)	$ 251	$ (1,859)	$ (162)
Net (loss) income per share:
Basic	$ (0.08)	$ 0.01	$ (0.08)	$ (0.01)
Diluted	$ (0.08)	$ 0.01	$ (0.08)	$ (0.01)
Shares used in per share calculations:
Basic (in thousands)	23,396	22,823	23,322	22,765
Diluted (in thousands)	23,396	22,912	23,322	22,765