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BUSINESS SEGMENTS (Tables)
12 Months Ended
May 31, 2018
Segment Reporting [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]

 Years ended May 31,

2018

 

2017

Net sales:

 

 

 

 

 

Europe

$

2,023,000

 

$

2,238,000

United States  

 

685,000

 

 

874,000

Asia

 

2,506,000

   

2,412,000

South America

 

214,000

 

 

65,000

Middle East

 

132,000

   

186,000

Other foreign

 

4,000

 

 

17,000

Total net sales

$

5,564,000

 

$

5,792,000