Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Statement [Abstract]
Net sales	$ 16,600	$ 22,291	$ 21,056
Cost of sales	10,568	13,920	13,454
Gross profit	6,032	8,371	7,602
Operating expenses:
Selling, general and administrative	6,562	7,530	7,724
Research and development	3,652	3,386	4,153
Restructuring	0	220	725
Total operating expenses	10,214	11,136	12,602
Loss from operations	(4,182)	(2,765)	(5,000)
Interest expense (income), net	(46)	10	(252)
Net gain from dissolution of Aehr Test Systems Japan	2,186	0	0
Other (expense) income, net	(162)	(11)	44
Loss before income tax benefit (expense)	(2,204)	(2,766)	(5,208)
Income tax (expense) benefit	177	(36)	(27)
Net loss	(2,027)	(2,802)	(5,235)
Less: Net income attributable to the noncontrolling interest	0	0	0
Net (loss) income attributable to Aehr Test Systems common shareholders	$ (2,027)	$ (2,802)	$ (5,235)
Net (loss) income per share - basic and diluted	$ (0.09)	$ (0.12)	$ (0.23)
Shares used in per share calculation - basic (in thousands)	23,457	22,882	22,387
Shares used in per share calculation - diluted (in thousands)	23,457	22,882	22,387