3. REVENUE (Tables)

6 Months Ended

Nov. 30, 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				Six Months Ended
	November 30,				November 30,
	2020		2019		2020		2019
Type of good / service:
Systems	$	171	$	3,027	$	972	$	5,961
Contactors		773		3,046		1,400		4,696
Services		739		801		1,323		1,750
	$	1,683	$	6,874	$	3,695	$	12,407
Product lines:
Wafer-level	$	1,251	$	6,335	$	2,810	$	11,161
Test During Burn-In		432		539		885		1,246
	$	1,683	$	6,874	$	3,695	$	12,407

    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,
	2020		2019		2020		2019
Geographic region:
United States	$	970	$	2,627	$	2,011	$	7,684
Asia		632		3,529		1,601		3,867
Europe		81		718		83		856
	$	1,683	$	6,874	$	3,695	$	12,407

    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. The following presents revenue based on timing of recognition (in thousands):

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2020		2019		2020		2019
Timing of revenue recognition:
Products and services transferred at a point in time	$	1,214	$	6,322	$	2,784	$	11,181
Services transferred over time		469		552		911		1,226
	$	1,683	$	6,874	$	3,695	$	12,407