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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Feb. 28, 2022
May 31, 2021
Level 1    
Investment securities $ 30,584 $ 580
Level 2    
Investment securities 0 0
Level 3    
Investment securities 0 0
Money Market Fund    
Investment securities 30,584 580
Money Market Fund | Level 1    
Investment securities 30,584 580
Money Market Fund | Level 2    
Investment securities 0 0
Money Market Fund | Level 3    
Investment securities $ 0 $ 0