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PRODUCT WARRANTIES (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
PRODUCT WARRANTIES (Details)    
Balance at the beginning of the year $ 494 $ 246
Accruals for warranties issued during the year 465 390
Adjustment to previously existing warranty 98 346
Consumption of reserves (647) (488)
Balance at the end of the year $ 410 $ 494