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8. PRODUCT WARRANTIES (Tables)
9 Months Ended
Feb. 28, 2017
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 nine months ended February 28, 2017 and February 29, 2016 (in thousands):

 

   Three Months Ended  Nine Months Ended
   Feb. 28,  Feb. 29,  Feb. 28,  Feb. 29,
   2017  2016  2017  2016
             
Balance at the beginning of the period  $72   $305   $155   $137 
                     
Accruals for warranties issued during the period   37    2    48    239 
                     
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)   (23)   (154)   (63)   (223)
                     
Balance at the end of the period  $86   $153   $86   $153