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8. PRODUCT WARRANTIES (Tables)
3 Months Ended
Aug. 31, 2020
Product Warranties Disclosures [Abstract]  
Liability for product warranties

    The following is a summary of changes in the Company's liability for product warranties during the three months ended August 31, 2020 and 2019 (in thousands):

 

   Three Months Ended
   August 31,
   2020  2019
       
Balance at the beginning of the period  $246   $154 
           
Accruals for warranties issued during the period   79    62 
Adjustments to previously existing warranty accruals   76    —   
Consumption of reserves   (71)   (24)
           
Balance at the end of the period  $330   $192