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6. INCOME TAXES - Statutory income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
INCOME TAXES      
U.S. Federal taxes at statutory rate $ (3,447) $ (4,446) $ (2,120)
State taxes, net of federal benefit 1 (1)  
Settlement of uncertain tax positions   524  
Stock-based compensation 605 482 (58)
Tax credits (497) (509) (494)
Foreign tax rate differential 1,277 2,419 593
Tax exempt interest   (5) (16)
Tax remeasurement (220)    
Non-deductible expenses and other 4 (2) 38
Income tax expense (benefit) before change in valuation allowance (2,277) (1,538) (2,057)
Valuation allowance 2,232 1,873 2,304
Provision for income taxes $ (45) $ 335 $ 247