INCOME TAXES (Details 3) - USD ($) $ in Thousands	May 31, 2023	May 31, 2022
Deferred tax assets:
Net operating losses	$ 11,964	$ 14,912
Lease liability	1,335	218
Credit carryforwards	6,235	5,535
Inventory reserves	938	934
Reserves and accruals	1,200	1,360
Capitalized research and development	1,187	0
Other	297	220
Less: Valuation allowance	(21,859)	(22,980)
Deferred tax assets	1,297	199
Deferred tax liabilities:
Operating lease right-of-use assets	1,297	199
Net deferred tax assets (liabilities)	$ 0	$ 0