3. REVENUE (Tables)

9 Months Ended

Feb. 29, 2020

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 29,		February 28,		February 29,		February 28,
	2020		2019		2020		2019
Type of good / service:
Systems	$	2,138	$	404	$	8,099	$	5,922
Contactors		3,094		1,445		7,790		3,541
Services		879		1,314		2,629		4,351
	$	6,111	$	3,163	$	18,518	$	13,814
Product lines:
Wafer-level	$	5,408	$	2,046	$	16,570	$	8,240
Test During Burn-In		703		1,117		1,948		5,574
	$	6,111	$	3,163	$	18,518	$	13,814

    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 29,		February 28,		February 29,		February 28,
	2020		2019		2020		2019
Geographic region:
United States	$	5,014	$	2,203	$	12,698	$	9,407
Asia		891		746		4,758		3,814
Europe		206		214		1,062		593
	$	6,111	$	3,163	$	18,518	$	13,814

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 29,		February 28,		February 29,		February 28,
	2020		2019		2020		2019
Timing of revenue recognition:
Products and services transferred at a point in time	$	5,485	$	2,507	$	16,666	$	11,897
Services transferred over time		626		656		1,852		1,917
	$	6,111	$	3,163	$	18,518	$	13,814