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8. PRODUCT WARRANTIES (Tables)
3 Months Ended
Aug. 31, 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 months ended August 31, 2017 and 2016 (in thousands):

 

    Three Months Ended  
    August 31,  
    2017     2016  
             
Balance at the beginning of the period   $ 113     $ 155  
                 
Accruals for warranties issued during the period     94       --  
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)     (88 )     (11 )
                 
Balance at the end of the period   $ 119     $ 90