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GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales - USD ($)	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Revenues from sales to unaffiliated customers:
Net Sales	$ 1,261,787	$ 1,143,806
Asia [Member]
Revenues from sales to unaffiliated customers:
Net Sales	675,000	347,000
Europe [Member]
Revenues from sales to unaffiliated customers:
Net Sales	471,000	591,000
North America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	105,000	134,000
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net Sales	8,000	29,000
South America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	$ 3,000	$ 43,000

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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).

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