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8. PRODUCT WARRANTIES (Tables)
6 Months Ended
Nov. 30, 2019
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, 2019 and 2018 (in thousands):

 

   Three Months Ended  Six Months Ended
   November 30,  November 30,
   2019  2018  2019  2018
             
Balance at the beginning of the period  $192   $160   $154   $135 
                     
Accruals for warranties issued during the period   79    71    141    146 
Consumption of reserves   (81)   (68)   (105)   (118)
                     
Balance at the end of the period  $190   $163   $190   $163