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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 |

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