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2. REVENUE RECOGNITION (Details) | 9 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true false] | true |
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true/false] | true |
Warranty period | 3 years |
SRAM products | Customer Concentration Risk |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Concentration risk percentage | 98.00% |
Sales revenue goods | Customer Concentration Risk |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Concentration risk percentage | 40.00% | 40.00%
Minimum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Payment terms | 30 days |
Maximum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Payment terms | 60 days |

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