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STOCK-BASED COMPENSATION (Details Narrative) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Total intrinsic values of options exercised | $ 867,000 | $ 57,000 | $ 11,902,000 | $ 151,000
RSUs granted | 0 | 4,000 | 169,000 | 165,000
Shares withheld for taxes and not issued |  | 4,000 | 40,000 | 4,000
Market value on the date of the grant |  | $ 2.25 | $ 2.98 | $ 1.87
RSUs fully vested | 21,000 | 19,000 | 50,000 | 34,000
RSUs unvested | 475,000 | 143,000 | 475,000 | 143,000
Intrinsic value of RSUs, nonvested | $ 6,460,000 | $ 400,000 | $ 6,460,000 | $ 400,000
Weighted average contractual life of the options exercisable and expected to be exercisable |  |  | 4 years 14 days | 3 years 8 months 4 days
Employee Stock Purchase Plan |  |  |  |
Unrecognized stock-based compensation | 648,000 |  | $ 648,000 |
Weighted average period for recognition of costs |  |  | 1 year |
Stock-based compensation related to the ESPP | $ 364,000 | $ 18,000 | $ 770,000 | $ 62,000
ESPP purchase right granted | 0 | 0 | 103,000 | 81,000
ESPP shares issued |  |  | 75,000 | 72,000
ESPP Shares available for issuance | 361,000 | 511,000 | 361,000 | 511,000
Board Of Directors |  |  |  |
RSUs granted | 0 | 34,000 | 43,000 | 126,000
Market value on the date of the grant |  | $ 2.25 | $ 8.02 | $ 1.73
RSUs fully vested |  |  | 33,000 |
RSUs unvested | 10,000 |  | 10,000 |
Intrinsic value of RSUs, nonvested | $ 136,000 |  | $ 136,000 |
RSU - Performance [Member] |  |  |  |
RSUs unvested | 270,000 |  | 270,000 |
Stock-based compensation expenses | $ 278,000 |  | $ 524,000 |
Stock Option and RSU |  |  |  |
Stock-based compensation expense related to stock options and RSUs | 516,000 | $ 253,000 | 1,416,000 | $ 736,000
2016 Equity Incentive Plan |  |  |  |
Unrecognized stock-based compensation | $ 1,915,000 |  | $ 1,915,000 |
Weighted average period for recognition of costs |  |  | 1 year 2 months 12 days |

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