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11. RELATED PARTY TRANSACTION (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Related Party Transaction [Line Items]          
Amount owed to WNC $ 0   $ 0   $ 8,000
Non-Recurring Engineering Services | Wistron Neweb Corp          
Related Party Transaction [Line Items]          
Non-recurring engineering service expense $ 0 $ 140,000 $ 0 $ 197,000