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5. ACCOUNTS RECEIVABLE, NET	3 Months Ended
Aug. 31, 2017
Accounts Receivable, Net, Current [Abstract]
5. ACCOUNTS RECEIVABLE, NET	5. ACCOUNTS RECEIVABLE, NET Accounts receivable represent customer trade receivables and is presented net of allowance for doubtful accounts of $92,000 at August 31, 2017 and $61,000 at May 31, 2017. 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.

5. ACCOUNTS RECEIVABLE, NET

3 Months Ended

Aug. 31, 2017

Accounts Receivable, Net, Current [Abstract]

5. ACCOUNTS RECEIVABLE, NET

Accounts receivable represent customer trade receivables and is presented net of allowance for doubtful accounts of $92,000 at August 31, 2017 and $61,000 at May 31, 2017. 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.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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