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8. PRODUCT WARRANTIES (Tables)
 3 Months Ended
Aug. 31, 2016
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 months ended August 31, 2016 and 2015 (in thousands): 

 

   Three Months Ended
   August 31,
   2016  2015
       
Balance at the beginning of the period  $155   $137 
           
Accruals for warranties issued during the period   —      109 
           
Accruals and adjustments (change in estimates) related to pre-existing warranties during the period   (54)   —   
           
Settlement made during the period (in cash or in kind)   (11)   (27)
           
Balance at the end of the period  $90   $219