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8. PRODUCT WARRANTIES (Tables)
6 Months Ended
Nov. 30, 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 and six months ended November 30, 2020 and 2019 (in thousands):

 

   Three Months Ended  Six Months Ended
   November 30,  November 30,
   2020  2019  2020  2019
             
Balance at the beginning of the period  $330   $192   $246   $154 
                     
Accruals for warranties issued during the period   113    79    192    141 
Adjustments to previously existing warranty accruals   11    —      87    —   
Consumption of reserves   (210)   (81)   (281)   (105)
                     
Balance at the end of the period  $244   $190   $244   $190