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1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
May 31, 2020
Accounting Policies [Abstract]
Useful life for property and equipment	The ranges of estimated useful lives are generally as follows: Furniture and fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 6 years Machinery and equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 6 years Test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 6 years

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

May 31, 2020

The ranges of estimated useful lives are generally as follows:

Furniture and fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 6 years

Machinery and equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 6 years

Test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 6 years