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Geographic Information (Tables)
9 Months Ended
Feb. 29, 2016
Geographic Information Disclosure [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]

 

Nine Months Ended

 

Three Months Ended

 

February 29,

2016

February 28,

2015

February 29,

2016

February 28,

2015

Revenues from sales to unaffiliated customers:

 

 

 

 

 

 

 

 

 

 

 

United States                            

$

776,000

$

784,000

$

370,000

$

310,000

Asia       

 

1,219,000

 

 

494,000

 

 

367,000

 

 

375,000

Europe

1,634,000

2,031,000

543,000

587,000

South America

 

50,000

 

 

8,000

 

 

1,000

 

 

3,000

Middle East                        

134,000

136,000

81,000

23,000

Other

 

1,000

 

 

14,000

 

 

 --

 

 

1,000

$

3,814,000

$

3,467,000

$

1,362,000

$

1,299,000