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13. PRODUCT WARRANTIES (Tables)
12 Months Ended
May 31, 2019
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, 2019 and 2018 (in thousands):

 

   May 31,
   2019  2018
       
Balance at the beginning of the year  $135   $113 
Accruals for warranties issued during the year   214    329 
Consumption of reserves   (195)   (307)
           
Balance at the end of the year  $154   $135