Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Income Statement [Abstract]
Net sales	$ 7,393	$ 2,681	$ 22,286	$ 12,215
Cost of sales	4,217	2,178	13,061	8,043
Gross profit	3,176	503	9,225	4,172
Operating expenses:
Selling, general and administrative	1,829	1,724	5,474	5,147
Research and development	1,040	1,248	3,085	3,348
Total operating expenses	2,869	2,972	8,559	8,495
Income (loss) from operations	307	(2,469)	666	(4,323)
Interest expense, net	(98)	(178)	(310)	(537)
Other (expense) income, net	(33)	(2)	(100)	38
Income (loss) before income tax benefit (expense)	176	(2,649)	256	(4,822)
Income tax benefit (expense)	91	(2)	81	(36)
Net income (loss)	267	(2,651)	337	(4,858)
Less: Net income attributable to the noncontrolling interest	0	0	0	0
Net income (loss) attributable to Aehr Test Systems common shareholders	$ 267	$ (2,651)	$ 337	$ (4,858)
Net income (loss) per share basic	$ 0.01	$ (0.16)	$ 0.02	$ (0.32)
Net income (loss) per share diluted	$ 0.01	$ (0.16)	$ 0.01	$ (0.32)
Shares used in per share calculations: basic (in thousands)	21,832	16,672	21,631	15,411
Shares used in per share calculations: diluted (in thousands)	22,641	16,672	22,838	15,411