BUSINESS SEGMENTS (Details) - Geographic information regarding net sales - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
Net sales:
Net Sales	$ 5,139,816	$ 4,962,373
Europe [Member]
Net sales:
Net Sales	2,166,000	2,716,000
UNITED STATES
Net sales:
Net Sales	995,000	1,042,000
Asia [Member]
Net sales:
Net Sales	1,731,000	1,016,000
South America [Member]
Net sales:
Net Sales	67,000	21,000
Middle East [Member]
Net sales:
Net Sales	180,000	143,000
Other Foreign [Member]
Net sales:
Net Sales	$ 1,000	$ 24,000