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GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales	$ 7,660,501	$ 3,628,638	$ 13,569,188	$ 6,144,970
Asia [Member]
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales	4,877,000	756,000	8,925,000	1,653,000
Europe [Member]
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales	2,416,000	2,611,000	3,683,000	3,781,000
North America [Member]
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales	286,000	133,000	820,000	374,000
South America [Member]
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales	81,000	64,000	87,000	146,000
Middle East [Member]
GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales [Line Items]
Net Sales		$ 65,000	$ 54,000	$ 191,000

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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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