3. REVENUE (Tables)

3 Months Ended

Aug. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

    The Company’s revenues by product category are as follows (in thousands):

	Three Months Ended
	August 31,
	2019		2018
Type of good / service:
Systems	$	2,934	$	1,806
Contactors		1,650		1,153
Services		949		1,781
	$	5,533	$	4,740
Product lines:
Wafer-level	$	4,826	$	1,969
Test During Burn-In		707		2,771
	$	5,533	$	4,740

    The following presents information about the Company’s operations in different geographic areas. Net sales are based upon ship-to location (in thousands):

	Three Months Ended
	August 31,
	2019		2018
Geographic region:
United States	$	5,057	$	2,695
Asia		338		1,734
Europe		138		311
	$	5,533	$	4,740

    With the exception of the amount of service contracts and extended warranties, the Company’s product category revenue is recognized at the point in time when control transfers to the customer.

	Three Months Ended
	August 31,
	2019		2018
Timing of revenue recognition:
Products and services transferred at a point in time a point in time	$	4,859	$	4,118
Services transferred over time		674		622
	$	5,533	$	4,740