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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% |

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