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7. PRODUCT WARRANTIES (Tables)
3 Months Ended
Aug. 31, 2018
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, 2018 and 2017 (in thousands):

 

    Three Months Ended  
    August 31,  
    2018     2017  
             
Balance at the beginning of the period   $ 135     $ 113  
                 
Accruals for warranties issued during the period     75       94  
Consumption of reserves     (50 )     (88 )
                 
Balance at the end of the period   $ 160     $ 119