GEOGRAPHIC INFORMATION (Tables)

9 Months Ended

Feb. 28, 2022

Geographic Information Disclosure [Abstract]

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

	Three Months Ended February 28,				Nine Months Ended February 28,
	2022		2021		2022		2021
Revenues from sales to unaffiliated customers:
Asia	$	4,877,000	$	756,000	$	8,925,000	$	1,653,000
Europe		2,416,000		2,611,000		3,683,000		3,781,000
North America		286,000		133,000		820,000		374,000
South America		81,000		64,000		87,000		146,000
Middle East		-		65,000		54,000		191,000
	$	7,660,000	$	3,629,000	$	13,569,000	$	6,145,000