Geographic Information (Details) - Geographic Information (Tables) (USD $)	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Revenues from sales to unaffiliated customers:
Net Sales	$ 1,013,739	$ 1,701,949
United States [Member]
Revenues from sales to unaffiliated customers:
Net Sales	255,000	280,000
Asia [Member]
Revenues from sales to unaffiliated customers:
Net Sales	136,000	902,000
Europe [Member]
Revenues from sales to unaffiliated customers:
Net Sales	604,000	508,000
South America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	3,000
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net Sales	15,000	11,000
Other Foreign [Member]
Revenues from sales to unaffiliated customers:
Net Sales	$ 1,000	$ 1,000