Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Income Statement [Abstract]
Net sales	$ 3,163	$ 7,393	$ 13,814	$ 22,286
Cost of sales	2,891	4,217	9,591	13,061
Gross profit	272	3,176	4,223	9,225
Operating expenses:
Selling, general and administrative	1,850	1,829	5,706	5,474
Research and development	931	1,040	3,033	3,085
Restructuring	607	0	607	0
Total operating expenses	3,388	2,869	9,346	8,559
(Loss) income from operations	(3,116)	307	(5,123)	666
Interest expense, net	(76)	(98)	(228)	(310)
Other (expense) income, net	(11)	(33)	27	(100)
(Loss) income before income tax benefit (expense)	(3,203)	176	(5,324)	256
Income tax benefit (expense)	2	91	(21)	81
Net (loss) income	(3,201)	267	(5,345)	337
Less: Net income attributable to the noncontrolling interest	0	0	0	0
Net (loss) income attributable to Aehr Test Systems common shareholders	$ (3,201)	$ 267	$ (5,345)	$ 337
Net (loss) income per share basic	$ (0.14)	$ 0.01	$ (0.24)	$ 0.02
Net (loss) income per share diluted	$ (0.14)	$ 0.01	$ (0.24)	$ 0.01
Shares used in per share calculations: basic (in thousands)	22,459	21,832	22,314	21,631
Shares used in per share calculations: diluted (in thousands)	22,459	22,641	22,314	22,838