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Geographic Information (Details) - Financial information about foreign and domestic operations and export sales - USD ($)	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Revenues from sales to unaffiliated customers:
Net sales	$ 1,361,608	$ 1,299,400	$ 3,813,683	$ 3,467,450
UNITED STATES
Revenues from sales to unaffiliated customers:
Net sales	370,000	310,000	776,000	784,000
Asia [Member]
Revenues from sales to unaffiliated customers:
Net sales	367,000	375,000	1,219,000	494,000
Europe [Member]
Revenues from sales to unaffiliated customers:
Net sales	543,000	587,000	1,634,000	2,031,000
South America [Member]
Revenues from sales to unaffiliated customers:
Net sales	1,000	3,000	50,000	8,000
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net sales	$ 81,000	23,000	134,000	136,000
Other Foreign [Member]
Revenues from sales to unaffiliated customers:
Net sales		$ 1,000	$ 1,000	$ 14,000

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- References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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