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1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018	Jun. 01, 2019
Cash and cash equivalents	$ 5,433	$ 5,428	$ 16,848
Allowance for doubtful accounts	0	0	0
System software development costs were capitalized or amortized	0	0	$ 0
Operating lease right-of-use assets	2,107	$ 0
Operating lease liabilities	$ 2,263
FASB ASC Topic 842
Operating lease right-of-use assets				$ 2,700
Operating lease liabilities				$ 2,800
North America \| Accounts Receivable
Concentration risk	13.00%	49.00%
Asia \| Accounts Receivable
Concentration risk	62.00%	25.00%
Europe \| Accounts Receivable
Concentration risk	25.00%	26.00%
Customer One \| Accounts Receivable
Concentration risk	45.00%	44.00%
Customer One \| Net Sales
Concentration risk	43.00%	36.00%
Customer Two \| Accounts Receivable
Concentration risk	18.00%	25.00%
Customer Two \| Net Sales
Concentration risk	16.00%	14.00%
Customer Three \| Accounts Receivable
Concentration risk		21.00%
Customer Three \| Net Sales
Concentration risk	15.00%	12.00%
Customer Four \| Net Sales
Concentration risk		10.00%