STOCK-BASED COMPENSATION (Details Narrative) - USD ($)	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Total intrinsic values of options exercised	$ 764,000	$ 1,902,000
Sotck Based Compensation Costs Capitalized As part of inventory	$ 85,000
RSUs granted	159,000	119,000
Shares repurchased for tax withholdings on vesting of RSUs, shares		40,000
Weighted average market value on the date of grant	$ 8.00	$ 2.93
RSUs unvested	442,000	240,000
Maximum amount of RSUs to be vested if all revenue goals are achieved	114,000	316,000
Weighted average remaining contractual life of the options exercisable and expected to be exercisable	4 years 1 month 6 days
Employee Stock Purchase Plan
Unrecognized stock-based compensation	$ 241,000
Weighted average period for recognition of costs	7 months 6 days
ESPP shares available for issuance	258,000
Stock-based compensation related to the ESPP	$ 175,000	$ 104,000
Board Of Directors
RSUs granted	30,000
Shares repurchased for tax withholdings on vesting of RSUs, shares	147,000	40,000
Weighted average market value on the date of grant	$ 8.00
Maximum amount of RSUs to be vested if all revenue goals are achieved	30,000
Stock based compensation expenses	$ 60,000
RSUs vested, net of tax	142,000	90,000
Intrinsic value of RSUs, nonvested	$ 6,423,000	$ 1,790,000
Stock Option and RSU
Weighted average market value on the date of grant	$ 2.93	$ 2.50
Stock-based compensation expense related to stock options and RSUs	$ 535,000	$ 484,000
Stock based compensation expenses	22,000
2016 Equity Incentive Plan
Unrecognized stock-based compensation	4,249,000
Estimated forfeitures of unvested stock based awards, amount	$ 11,000
Weighted average period for recognition of costs	2 years 3 months 18 days
RSU
Weighted average market value on the date of grant	$ 8.03	$ 2.93