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EMPLOYEE STOCK PLANS (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
May 31, 2024 | May 31, 2023 | May 31, 2022
Net effect on net income | $ 2,518 | $ 2,748 | $ 2,923
Effect on net loss per share, basic | $ 0.09 | $ 0.10 | $ 0.11
Effect on net loss per share, diluted | $ 0.09 | $ 0.09 | $ 0.11
Cost of Sales |  |  |
Total stock-based compensation | $ 330 | $ 331 | $ 234
Selling, General and Administrative |  |  |
Total stock-based compensation | 1,549 | 1,711 | 1,721
Research and Development |  |  |
Total stock-based compensation | $ 639 | $ 706 | $ 968

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