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11. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | $ 2,854,000 | $ 2,566,000 | $ 2,266,000
Cost of revenues |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 346,000 | 257,000 | 234,000
Research and development |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 1,509,000 | 1,487,000 | 1,310,000
Selling, general and administrative |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 999,000 | 822,000 | 722,000
2007 Employee Stock Purchase Plan |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | $ 276,000 | $ 220,000 | $ 211,000

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