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Geographic Information (Tables)
3 Months Ended
Aug. 31, 2014
Geographic Information Disclosure [Text Block] [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

 

Three Months Ended

 

August 31,

 

2014

 

2013

 

 

 

 

 

 

Revenues from sales to unaffiliated customers:

 

 

 

 

 

United States

253,000

 

$

255,000

Asia

 

16,000

 

 

136,000

Europe

 

752,000

 

 

604,000

South America

 

3,000

 

 

3,000

Middle East

 

2,000

 

 

15,000

Other

 

9,000

 

 

1,000

 

$

1,035,000

 

$

1,014,000