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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. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Revenues from sales to unaffiliated customers:
Net Sales	$ 1,375,666	$ 1,499,930	$ 4,433,785	$ 4,342,247
UNITED STATES
Revenues from sales to unaffiliated customers:
Net Sales	208,000	345,000	533,000	743,000
Asia [Member]
Revenues from sales to unaffiliated customers:
Net Sales	626,000	448,000	2,112,000	1,740,000
Europe [Member]
Revenues from sales to unaffiliated customers:
Net Sales	485,000	654,000	1,562,000	1,672,000
South America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	3,000	13,000	106,000	43,000
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net Sales	54,000	37,000	115,000	127,000
Other Foreign [Member]
Revenues from sales to unaffiliated customers:
Net Sales		$ 3,000	$ 6,000	$ 17,000

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- References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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