Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Income Statement [Abstract]
Net sales	$ 29,555	$ 18,898	$ 14,501
Cost of sales	17,169	12,118	9,356
Gross profit	12,386	6,780	5,145
Operating expenses:
Selling, general and administrative	7,290	7,052	6,975
Research and development	4,181	4,657	4,324
Total operating expenses	11,471	11,709	11,299
Income (loss) from operations	915	(4,929)	(6,154)
Interest expense	(399)	(678)	(605)
Other expense, net	(61)	(21)	(16)
Income (loss) before income tax benefit (expense)	455	(5,628)	(6,775)
Income tax benefit (expense)	73	(25)	(10)
Net income (loss)	528	(5,653)	(6,785)
Less: Net income attributable to the noncontrolling interest	0	0	0
Net income (loss) attributable to Aehr Test Systems common shareholders	$ 528	$ (5,653)	$ (6,785)
Net income (loss) per share - basic and diluted	$ 0.02	$ (0.35)	$ (0.52)
Shares used in per share calculation - basic	21,732,000	16,267,000	13,091,000
Shares used in per share calculation - diluted	22,782,000	16,267,000	13,091,000