GEOGRAPHIC INFORMATION (Tables)

12 Months Ended

May 31, 2021

Geographic Information Disclosure [Abstract]

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

	Year Ended
	May 31, 2021			May 31, 2020
Revenues from sales to unaffiliated customers:
Europe	$	4,301,000	60%	$	2,434,000	36%
Asia		1,908,000	26%		1,867,000	28%
United States		548,000	8%		445,000	7%
South America		250,000	3%		1,615,000	24%
Middle East		192,000	3%		314,000	5%
Other		-	0%		18,000	0%
Total	$	7,199,000	100%	$	6,693,000	100%