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Geographic Information (Details) - Financial information about foreign and domestic operations and export sales - USD ($)	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	$ 1,272,870	$ 1,444,483
UNITED STATES
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	143,000	187,000
Asia [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	648,000	620,000
Europe [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	392,000	532,000
South America [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	71,000	75,000
Middle East [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	19,000	26,000
Other Foreign [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales		$ 4,000

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- References

No definition available.

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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
-Subparagraph (a)
-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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