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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, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	$ 1,261,161	$ 1,375,666	$ 4,034,822	$ 4,433,785
UNITED STATES
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	141,000	208,000	423,000	533,000
Asia [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	653,000	626,000	1,973,000	2,112,000
Europe [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	416,000	485,000	1,330,000	1,562,000
South America [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	2,000	3,000	129,000	106,000
Middle East [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	49,000	54,000	180,000	115,000
Other Foreign [Member]
Geographic Information (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales				$ 6,000

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- References

No definition available.

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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://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 3: 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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-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=116634182&loc=SL114868664-224227

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