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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