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8. PRODUCT WARRANTIES (Tables)
3 Months Ended
Aug. 31, 2019
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, 2019 and 2018 (in thousands):

 

    Three Months Ended  
    August 31,  
    2019     2018  
             
Balance at the beginning of the period   $ 154     $ 135  
                 
Accruals for warranties issued during the period     62        75   
Consumption of reserves     (24)       (50)  
                 
Balance at the end of the period   $ 192     $ 160