STOCKBASED COMPENSATION (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Total intrinsic values of options exercised	$ 10,827,000	$ 867,000	$ 14,183,000	$ 11,902,000
Stock Based Compensation Costs Capitalized As part of inventory	110,000
Weighted average remaining contractual life of the options exercisable and expected to be exercisable			4 years 1 month 2 days	4 years 14 days
2016 Equity Incentive Plan
Unrecognized stock-based compensation	$ 3,348,000		$ 3,348,000
Weighted average period for recognition of costs	2 years 1 month 6 days
Stock Option and RSU
Stock-based compensation expense related to stock options and RSUs	$ 424,000	516,000	$ 1,536,000	$ 1,416,000
Employee Stock Purchase Plan
ESPP purchase right granted			43,000	103,000
ESPP share issued			109,000	75,000
Unrecognized stock-based compensation	$ 261,000		$ 261,000
Weighted average period for recognition of costs			1 year
ESPP shares available for issuance	499,000		499,000
Stock-based compensation related to the ESPP	$ 168,000	$ 364,000	$ 559,000	$ 770,000
Estimated forfeitures of unvested stock based awards, amount	$ 8,000		$ 8,000