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GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	$ 1,372,526	$ 1,596,408	$ 2,516,332	$ 2,790,823
UNITED STATES
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	107,000	109,000	241,000	224,000
Asia [Member]
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	550,000	797,000	897,000	1,460,000
Europe [Member]
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	580,000	416,000	1,170,000	717,000
South America [Member]
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	39,000	24,000	82,000	71,000
Middle East [Member]
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	96,000	241,000	125,000	309,000
Other [Member]
GEOGRAPHIC INFORMATION (Details) - Financial information about foreign and domestic operations and export sales [Line Items]
Net Sales	$ 1,000	$ 10,000	$ 1,000	$ 10,000

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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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