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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 |  |

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