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8. PRODUCT WARRANTIES (Tables)
 9 Months Ended
Feb. 28, 2015
Product Warranties Disclosures [Abstract]  
Liability for product warranties

    Following is a summary of changes in the Company's liability for product warranties during the three and nine months ended February 28, 2015 and 2014 (in thousands):

 

    Three Months Ended     Nine Months Ended  
    February 28,     February 28,  
    2015     2014     2015     2014
                       
Balance at the beginning of the period   $ 149     $ 208     $ 223     $ 222  
                                 
Accruals for warranties issued during the period     47       34       145       188  
                                 
Settlement made during the period (in cash or in kind)     (34 )     (46 )     (206 )     (214 )
                                 
Balance at the end of the period   $ 162     $ 196     $ 162     $ 196