Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Income Statement [Abstract]
Net sales	$ 5,267	$ 6,111	$ 8,962	$ 18,518
Cost of sales	3,373	3,120	6,464	10,054
Gross profit	1,894	2,991	2,498	8,464
Operating expenses:
Selling, general and administrative	1,643	1,891	4,658	5,856
Research and development	903	845	2,623	2,532
Total operating expenses	2,546	2,736	7,281	8,388
(Loss) income from operations	(652)	255	(4,783)	76
Interest (expense) income, net	(10)	13	(35)	27
Net gain from dissolution of Aehr Test Systems Japan	0	0	2,186	0
Other (expense) income, net	(39)	(9)	(139)	6
(Loss) income before income tax (expense) benefit	(701)	259	(2,771)	109
Income tax (expense) benefit	(34)	(14)	177	(26)
Net (loss) income	(735)	245	(2,594)	83
Less: Net income attributable to the noncontrolling interest	0	0	0	0
Net (loss) income attributable to Aehr Test System common shareholders	$ (735)	$ 245	$ (2,594)	$ 83
Net (loss) income per share:
Basic	$ (0.03)	$ 0.01	$ (0.11)	$ 0
Diluted	$ (0.03)	$ 0.01	$ (0.11)	$ 0
Shares used in per share calculations:
Basic (in thousands)	23,525	22,937	23,390	22,823
Diluted (in thousands)	23,525	23,130	23,390	22,940