BUSINESS SEGMENTS (Detail) - BUSINESS SEGMENTS (USD $)	12 Months Ended
	May 31, 2012	May 31, 2011
Net sales:
Net Sales	$ 6,081,000	$ 4,899,000
Europe
Net sales:
Net Sales	2,533,000	2,483,000
United States
Net sales:
Net Sales	1,074,000	1,160,000
Asia
Net sales:
Net Sales	2,420,000	1,153,000
South America
Net sales:
Net Sales	2,000	28,000
Middle East
Net sales:
Net Sales	22,000	45,000
Other Foreign
Net sales:
Net Sales	$ 30,000	$ 30,000