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BALANCE SHEET DETAIL (Details 1) - USD ($)
$ in Thousands
May 31, 2022
May 31, 2021
BALANCE SHEET DETAIL (Details 1)    
Leasehold improvements $ 1,230 $ 1,214
Furniture and fixtures 697 627
Machinery and equipment 4,013 3,343
Test equipment 2,523 2,525
Property and equipment, gross 8,463 7,709
Less: Accumulated depreciation and amortization (7,260) (7,032)
Property and equipment, net $ 1,203 $ 677