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8. PRODUCT WARRANTIES (Tables)
 3 Months Ended
Aug. 31, 2015
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, 2015 and 2014 (in thousands):

 

    Three Months Ended  
    August 31,  
    2015     2014  
             
Balance at the beginning of the period   $ 137     $ 223  
                 
Accruals for warranties issued during the period     109       32  
Settlement made during the period (in cash or in kind)     (27 )     (87 )
                 
Balance at the end of the period   $ 219     $ 168