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5. ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
May 31, 2018
Receivables [Abstract]  
Accounts receivable

Accounts receivable comprise (in thousands):

 

   May 31,
   2018  2017
Accounts receivable  $2,860   $4,071 
Less: Allowance for doubtful accounts   (4)   (61)
   $2,856   $4,010 

 

      Additions      
   Balance at  charged to     Balance
   beginning  costs and     at end
   of year  expenses  Deductions*  of year
Allowance for doubtful accounts receivable:                    
     May 31, 2018  $61   $4   $(61)  $4 
                     
     May 31, 2017  $8   $53   $—     $61 

 

    * Deductions include write-offs of uncollectible accounts, collections of amounts previously reserved, and releases of allowance for doubtful accounts credited to expense.