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8. PRODUCT WARRANTIES (Tables)
 6 Months Ended
Nov. 30, 2014
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 six months ended November 30, 2014 and 2013 (in thousands):

 

    Three Months Ended     Six Months Ended  
    November 30,     November 30,  
    2014     2013     2014     2013  
                         
Balance at the beginning of the period   $ 168     $ 226     $ 223     $ 222  
                                 
Accruals for warranties issued during the period     66       62       98       154  
                               
Settlement made during the period (in cash or in kind)     (85 )     (80 )     (172 )     (168 )
                                 
Balance at the end of the period   $ 149     $ 208     $ 149     $ 208