3. REVENUE (Tables)

9 Months Ended

Feb. 28, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended				Nine Months Ended
	February 28,		February 29,		February 28,		February 29,
	2021		2020		2021		2020
Type of good / service:
Systems	$	2,435	$	2,138	$	3,407	$	8,099
Contactors		1,930		3,094		3,330		7,790
Services		902		879		2,225		2,629
	$	5,267	$	6,111	$	8,962	$	18,518
Product lines:
Wafer-level	$	4,993	$	5,408	$	7,804	$	16,570
Test During Burn-In		274		703		1,158		1,948
	$	5,267	$	6,111	$	8,962	$	18,518

    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				Nine Months Ended
	February 28,		February 29,		February 28,		February 29,
	2021		2020		2021		2020
Geographic region:
United States	$	1,113	$	5,014	$	3,124	$	12,698
Asia		4,122		891		5,723		4,758
Europe		32		206		115		1,062
	$	5,267	$	6,111	$	8,962	$	18,518

    With the exception of the amount of service contracts and extended warranties, the Company’s product category revenues are recognized at a point in time when control transfers to customers. The following presents revenue based on timing of recognition (in thousands):

	Three Months Ended				Nine Months Ended
	February 28,		February 29,		February 28,		February 29,
	2021		2020		2021		2020
Timing of revenue recognition:
Products and services transferred at a point in time	$	4,944	$	5,485	$	7,728	$	16,666
Services transferred over time		323		626		1,234		1,852
	$	5,267	$	6,111	$	8,962	$	18,518