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8. PRODUCT WARRANTIES (Tables)
9 Months Ended
Feb. 28, 2021
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 nine months ended February 28, 2021 and February 29, 2020 (in thousands):

 

   Three Months Ended  Nine Months Ended
   February 28,  February 29,  February 28,  February 29,
   2021  2020  2021  2020
             
Balance at the beginning of the period  $244   $190   $246   $154 
                    
Accruals for warranties issued during the period   78    26    270    167 
Adjustments to previously existing warranty accruals   259    —      346    —   
Consumption of reserves   (81)   (30)   (362)   (135)
                     
Balance at the end of the period  $500   $186   $500   $186