Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (2,027)	$ (2,802)	$ (5,235)
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Stock-based compensation expense	1,101	910	905
Recovery of doubtful accounts	0	0	(3)
Depreciation and amortization	310	384	431
Loss on disposal of assets	0	45	0
Net gain from dissolution of Aehr Test Systems Japan	(2,186)	0	0
Income tax benefit related to dissolution of Aehr Test Systems Japan	(215)	0	0
Changes in operating assets and liabilities:
Accounts receivable	(1,373)	1,161	(2,043)
Inventories	(972)	1,164	(112)
Prepaid expenses and other	(81)	271	84
Accounts payable	1,877	(1,024)	210
Accrued expenses	732	(589)	402
Customer deposits and deferred revenue	96	(1,542)	(355)
Deferred rent	0	0	90
Other long-term liabilities	47	0	0
Income taxes payable	(10)	(2)	(11)
Net cash used in operating activities	(2,701)	(2,024)	(5,637)
Cash flows from investing activities:
Purchases of property and equipment	(227)	(163)	(173)
Net cash used in investing activities	(227)	(163)	(173)
Cash flows from financing activities:
Repayment of convertible notes	0	0	(6,110)
Proceeds from long-term debt	0	1,679	0
Line of credit borrowings, net	1,400	0	0
Proceeds from issuance of common stock under employee plans	580	503	559
Shares repurchased for tax withholdings on vesting of restricted stock units	(20)	(10)	0
Net cash provided by (used in) financing activities	1,960	2,172	(5,551)
Effect of exchange rates on cash, cash equivalents and restricted cash	117	20	(59)
Net increase (decrease) in cash, cash equivalents and restricted cash	(851)	5	(11,420)
Cash, cash equivalents and restricted cash, beginning of year	5,513	5,508	16,928
Cash, cash equivalents and restricted cash, end of year	4,662	5,513	5,508
Supplemental cash flow information:
Cash paid during the year for Income taxes	15	42	37
Cash paid during the year for Interest	6	0	610
Supplemental disclosure of non-cash flow information:
Net transfer of equipment between inventory and property and equipment	$ 113	$ 112	$ 119