Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Income Statement [Abstract]
Net sales	$ 22,291	$ 21,056	$ 29,555
Cost of sales	13,920	13,454	17,169
Gross profit	8,371	7,602	12,386
Operating expenses:
Selling, general and administrative	7,530	7,724	7,290
Research and development	3,386	4,153	4,181
Restructuring	220	725	0
Total operating expenses	11,136	12,602	11,471
(Loss) income from operations	(2,765)	(5,000)	915
Interest income (expense), net	10	(252)	(399)
Other (expense) income, net	(11)	44	(61)
(Loss) income before income tax (expense) benefit	(2,766)	(5,208)	455
Income tax (expense) benefit	(36)	(27)	73
Net (loss) income	(2,802)	(5,235)	528
Less: Net income attributable to the noncontrolling interest	0	0	0
Net (loss) income attributable to Aehr Test Systems common shareholders	$ (2,802)	$ (5,235)	$ 528
Net (loss) income per share - basic and diluted	$ (0.12)	$ (0.23)	$ 0.02
Shares used in per share calculation - basic (in thousands)	22,882	22,387	21,732
Shares used in per share calculation - diluted (in thousands)	22,882	22,387	22,782