3. REVENUE (Tables)

6 Months Ended

Nov. 30, 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				Six Months Ended
	November 30,				November 30,
	2019		2018		2019		2018
Type of good / service:
Systems	$	3,027	$	3,712	$	5,961	$	5,518
Contactors		3,046		943		4,696		2,096
Services		801		1,256		1,750		3,037
	$	6,874	$	5,911	$	12,407	$	10,651
Product lines:
Wafer-level	$	6,335	$	4,226	$	11,161	$	6,195
Test During Burn-In		539		1,685		1,246		4,456
	$	6,874	$	5,911	$	12,407	$	10,651

    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				Six Months Ended
	November 30,				November 30,
	2019		2018		2019		2018
Geographic region:
United States	$	2,627	$	4,509	$	7,684	$	7,204
Asia		3,529		1,334		3,867		3,068
Europe		718		68		856		379
	$	6,874	$	5,911	$	12,407	$	10,651

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

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2019		2018		2019		2018
Timing of revenue recognition:
Products and services transferred at a point in time	$	6,322	$	5,272	$	11,181	$	9,390
Services transferred over time		552		639		1,226		1,261
	$	6,874	$	5,911	$	12,407	$	10,651