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12. RELATED PARTY TRANSACTION (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Related Party Transaction [Line Items]    
Amount owed to WNC $ 155,000 $ 37,000
Non-Recurring Engineering Services | Wistron Neweb Corp    
Related Party Transaction [Line Items]    
Non-recurring engineering service expense $ 482,000 $ 357,000