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GEOGRAPHIC INFORMATION (Tables)
12 Months Ended
May 31, 2020
Geographic Information Disclosure [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]

Years ended May 31,

 

2020

 

2019

Net sales:

 

 

 

 

 

 

Europe

$

2,434,000

$

1,694,000

United States  

 

 

445,000

 

 

523,000

Asia

1,867,000

2,514,000

South America

 

 

1,615,000

 

 

256,000

Middle East

314,000

214,000

Other foreign

 

 

18,000

 

 

 --

Total net sales

 

$

6,693,000

 

$

5,201,000