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

 

Three Months Ended

 

August 31, 2020

 

August 31, 2019

Revenues from sales to unaffiliated customers:

 

 

 

United States

$

134,000

 

$

115,000

Asia

 

347,000

 

 

663,000

Europe

 

591,000

 

 

301,000

South America

 

43,000

 

 

47,000

Middle East

 

29,000

 

 

68,000

 

$

1,144,000

 

$

1,194,000