Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Income Statement [Abstract]
Net sales	$ 5,911	$ 7,923	$ 10,651	$ 14,893
Cost of sales	3,513	4,792	6,700	8,844
Gross profit	2,398	3,131	3,951	6,049
Operating expenses:
Selling, general and administrative	1,977	1,854	3,856	3,645
Research and development	986	1,090	2,102	2,045
Total operating expenses	2,963	2,944	5,958	5,690
(Loss) income from operations	(565)	187	(2,007)	359
Interest expense, net	(74)	(105)	(152)	(212)
Other income (expense), net	29	(7)	38	(67)
(Loss) income before income tax expense	(610)	75	(2,121)	80
Income tax expense	(19)	(15)	(23)	(10)
Net (loss) income	(629)	60	(2,144)	70
Less: Net income attributable to the noncontrolling interest	0	0	0	0
Net (loss) income attributable to Aehr Test Systems common shareholders	$ (629)	$ 60	$ (2,144)	$ 70
Net (loss) income per share basic	$ (0.03)	$ 0.00	$ (0.10)	$ 0.00
Net (loss) income per share diluted	$ (0.03)	$ 0.00	$ (0.10)	$ 0.00
Shares used in per share calculations: basic (in thousands)	22,294	21,645	22,242	21,531
Shares used in per share calculations: diluted (in thousands)	22,294	22,883	22,242	22,937