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13. PRODUCT WARRANTIES (Tables)
12 Months Ended
May 31, 2018
Product Warranties Disclosures [Abstract]  
Liability for product warranties

    Following is a summary of changes in the Company’s liability for product warranties during the fiscal years ended May 31, 2018 and 2017 (in thousands):

 

   May 31,
   2018  2017
       
Balance at the beginning of the year  $113   $155 
Accruals for warranties issued during the year   329    123 
Accruals and adjustments (change in estimates) related to pre-existing warranties during the year   —      (54)
Consumption of reserves   (307)   (111)
           
Balance at the end of the year  $135   $113