SEGMENT AND CONCENTRATION INFORMATION (Details Narrative) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021	May 31, 2022
Operating lease right-of-use assets	$ 561,000		$ 561,000		$ 917,000
United States [Member]
Operating lease right-of-use assets	479,000		479,000
Asia [Member]
Operating lease right-of-use assets	$ 82,000		$ 82,000
Customer A [Member]
Customers accounted for 10% or more of total revenues	79.00%	82.00%	74.00%	77.00%
Customers B [Member]
Customers accounted for 10% or more of total revenues	15.00%		18.00%
Five Largest Customers [Member]
Customers accounted for 10% or more of total revenues	98.00%	98.00%	98.00%	96.00%