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Geographic Information (Tables)
 3 Months Ended
Aug. 31, 2013
Geographic Information Disclosure [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
 

Three Months Ended

 

August 31,

 

 

2013

 

 

2012

           
Revenues from sales to unaffiliated customers:          
United States                       $ 255,000   $ 280,000
Asia                                     136,000     902,000
Europe                                                         604,000     508,000
South America                                                        3,000    

--

Middle East                                 15,000     11,000
Other       1,000     1,000
 Total Net Sales $ 1,014,000   $ 

1,702,000