BUSINESS SEGMENTS (Tables)

12 Months Ended

May 31, 2017

Segment Reporting [Abstract]

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

Years ended May 31,	2017		2016
Net sales:
Europe	$	2,238,000	$	2,166,000
United States		874,000		995,000
Asia		2,412,000		1,731,000
South America		65,000		67,000
Middle East		186,000		180,000
Other foreign		17,000		1,000
Total net sales	$	5,792,000	$	5,140,000