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5. PRODUCT WARRANTIES (Tables)
12 Months Ended
May 31, 2017
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, 2017 and 2016 (in thousands):

   May 31,
   2017  2016
       
Balance at the beginning of the year  $155   $137 
Accruals for warranties issued during the year   123    334 
Accruals and adjustments (change in estimates) related to pre-existing warranties during the year   (54)   —   
Settlement made during the year (in cash or in kind)   (111)   (316)
           
Balance at the end of the year  $113   $155