1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
Cash and cash equivalents	$ 4,582	$ 5,433	$ 5,428
Allowance for doubtful accounts		0	0
Provision for inventory reserves	176	1,669	1,168
System software development costs were capitalized or amortized	0	0	0
Comprehensive income related to liquidation	$ 2,401	$ 0	$ 0
North America \| Accounts Receivable
Concentration risk	2.00%	13.00%
Asia \| Accounts Receivable
Concentration risk	98.00%	62.00%
Europe \| Accounts Receivable
Concentration risk	0.00%	25.00%
Customer One \| Accounts Receivable
Concentration risk	51.00%	45.00%
Customer One \| Net Sales
Concentration risk	24.00%	43.00%
Customer Two \| Accounts Receivable
Concentration risk	24.00%	18.00%
Customer Two \| Net Sales
Concentration risk	23.00%	16.00%
Customer Three \| Accounts Receivable
Concentration risk	19.00%
Customer Three \| Net Sales
Concentration risk	20.00%	15.00%
Customer Four \| Net Sales
Concentration risk	10.00%

Amount of allowance for credit loss on accounts receivable.

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Amount of expense for amortization of capitalized computer software costs.

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