SEGMENT INFORMATION (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021	May 31, 2021
Operating lease right-of-use assets	$ 1,091,000		$ 1,091,000		$ 1,606,000
Asia [Member]
Operating lease right-of-use assets	101,000		101,000
United States [Member]
Operating lease right-of-use assets	$ 990,000		$ 990,000
Customer One [Member]
Customers accounted for 10% or more of total revenues	90.00%		84.00%
Customer A [Member]
Customers accounted for 10% or more of total revenues		55.00%		33.00%
Customers B [Member]
Customers accounted for 10% or more of total revenues		15.00%		15.00%
Customers C [Member]
Customers accounted for 10% or more of total revenues		11.00%		14.00%
Customers D [Member]
Customers accounted for 10% or more of total revenues		11.00%		11.00%
Five Largest Customers [Member]
Customers accounted for 10% or more of total revenues	99.00%	95.00%	97.00%	82.00%