GEOGRAPHIC INFORMATION (Tables)

6 Months Ended

Nov. 30, 2022

Geographic Information Disclosure Abstract

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended November 30,				Six Months Ended November 30,
	2022		2021		2022		2021
Revenues from sales to unaffiliated customers:
Asia	$	663,000	$	3,373,000	$	1,477,000	$	4,048,000
Europe		415,000		796,000		967,000		1,267,000
North America		401,000		429,000		669,000		534,000
South America		3,000		3,000		6,000		6,000
Middle East		-		46,000		-		54,000
	$	1,482,000	$	4,647,000	$	3,119,000	$	5,909,000