5. ACCOUNTS RECEIVABLE, NET

6 Months Ended

Nov. 30, 2015

Accounts Receivable, Net, Current [Abstract]

5. ACCOUNTS RECEIVABLE

5.  ACCOUNTS RECEIVABLE, NET

   Accounts receivable represents customer trade receivables and is presented net of allowances for doubtful accounts of $38,000 at November 30, 2015 and $21,000 at May 31, 2015.  Accounts receivable are derived from the sale of products throughout the world to semiconductor manufacturers, semiconductor contract assemblers, electronics manufacturers and burn-in and test service companies.  The Company’s allowance for doubtful accounts is based upon historical experience and review of trade receivables by aging category to identify specific customers with known disputes or collection issues.  Uncollectible receivables are recorded as bad debt expense when all efforts to collect have been exhausted and recoveries are recognized when they are received.