STOCKHOLDERS EQUITY AND STOCK-BASED COMPENSATION (Details Narrative) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Total intrinsic values of options exercised	$ 12,542,000	$ 152,000	$ 160,000
Stock based compensation expenses	$ 83,000
Option exercisable shares (in thousands)	1,042,000	2,045,000	2,203,000
Weighted average exercise price for options exercisable	$ 2.22	$ 2.26	$ 2.25
RSUs granted (in thousands)	209,000	170,000
Shares repurchased for tax withholdings on vesting of RSUs, shares (in thousands)	40,000	9,000	6,000
Market value on the date of the grant	$ 2.89	$ 1.92	$ 1.64
RSUs vested (in thousands)	158,000	37,000	13,000
RSUs unvested (in thousands)	185,000	132,000	10,000
Intrinsic value of RSUs, nonvested	$ 1,554,000	$ 297,000	$ 16,000
Maximum amount of RSUs to be vested if all revenue goals are achieved	270,000
RSUs weighted average of per share	$ 3.41
Stock Option and RSU
Stock-based compensation expense related to stock options and RSUs	$ 2,071,000	$ 993,000	$ 751,000
RSUs cancelled (in thousands)	10,000	1,000	0
Stock based compensation expenses	$ 921,000
2016 Equity Incentive Plan
Unrecognized stock-based compensation		$ 1,905,000
Common stock reserved for issuance	4,848,000
Remained available for issuance	2,248,000
Share Authorized	3,879,000	4,036,000	4,813,000
Stock options and RSUs outstanding	2,052,000	2,898,000	3,163,000
Estimated forfeitures of unvested stock based awards, amount		$ 5,000
Weighted average period for recognition of costs	1 year 3 months 18 days
Board Of Directors
RSUs granted (in thousands)	43,000	161,000	9,000
Market value on the date of the grant	$ 8.02	$ 1.81	$ 1.64
Employee Stock Purchase Plan
Common stock reserved for issuance	2,200,000
Purchase rights under the ESPP	$ 417,000
Weighted average period for recognition of costs	9 months 18 days
Stock-based compensation related to the ESPP	$ 935,000	$ 108,000	$ 159,000
Maximum calendar year contribution per employee	$ 25,000	$ 25,000	$ 25,000,000
Maximum number of shares a participant may purchase (in thousands)	3,000	3,000	3,000
ESPP purchase right granted (in thousands)	101,000	279,000	55,000
ESPP shares issued (in thousands)	178,000	147,000	136,000
Total shares issued under ESPP plan (in thousands)		1,942,000
ESPP Shares available for issuance (in thousands)		258,000
Number of authorized shares increased	350,000