GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Revenues from sales to unaffiliated customers:
Net Sales	$ 1,481,915	$ 4,646,900	$ 3,119,350	$ 5,908,687
Asia [Member]
Revenues from sales to unaffiliated customers:
Net Sales	663,000	3,373,000	1,477,000	4,048,000
Europe [Member]
Revenues from sales to unaffiliated customers:
Net Sales	415,000	796,000	967,000	1,267,000
North America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	401,000	429,000	669,000	534,000
South America [Member]
Revenues from sales to unaffiliated customers:
Net Sales	3,000	3,000	6,000	6,000
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net Sales		$ 46,000		$ 54,000