Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Income Statement [Abstract]
Net sales	$ 21,056	$ 29,555	$ 18,898
Cost of sales	13,454	17,169	12,118
Gross profit	7,602	12,386	6,780
Operating expenses:
Selling, general and administrative	7,724	7,290	7,052
Research and development	4,153	4,181	4,657
Restructuring	725	0	0
Total operating expenses	12,602	11,471	11,709
(Loss) income from operations	(5,000)	915	(4,929)
Interest expense	(252)	(399)	(678)
Other income (expense), net	44	(61)	(21)
(Loss) income before income tax (expense) benefit	(5,208)	455	(5,628)
Income tax (expense) benefit	(27)	73	(25)
Net (loss) income	(5,235)	528	(5,653)
Less: Net income attributable to the noncontrolling interest	0	0	0
Net (loss) income attributable to Aehr Test Systems common shareholders	$ (5,235)	$ 528	$ (5,653)
Net (loss) income per share - basic and diluted	$ (0.23)	$ 0.02	$ (0.35)
Shares used in per share calculation - basic (in thousands)	22,387	21,732	16,267
Shares used in per share calculation - diluted (in thousands)	22,387	22,782	16,267