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GEOGRAPHIC INFORMATION (Tables)
3 Months Ended
Aug. 31, 2021
Geographic Information Disclosure [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]

Three Months Ended

August 31, 2021

August 31, 2020

Revenues from sales to unaffiliated customers:

Asia

 

$

675,000

 

$

347,000

Europe

471,000

591,000

North America

 

 

105,000

 

 

134,000

Middle East

8,000

29,000

South America

 

 

3,000

 

 

43,000

$

1,262,000

$

1,144,000