SEGMENT INFORMATION (Details Narrative) - USD ($)	3 Months Ended
Aug. 31, 2022	Aug. 31, 2021	May 31, 2022
Operating lease right-of-use assets	$ 740,000		$ 917,000
Customer A [Member]
Customers accounted for 10% or more of total revenues	67.00%	69.00%
Customers B [Member]
Customers accounted for 10% or more of total revenues	23.00%	16.00%
United States [Member]
Operating lease right-of-use assets	$ 652,000
Asia [Member]
Operating lease right-of-use assets	$ 88,000
Five Largest Customers [Member]
Customers accounted for 10% or more of total revenues	98.00%	95.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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