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11. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | $ 2,262,000 | $ 2,838,000 | $ 2,469,000
Cost of revenues |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 199,000 | 228,000 | 202,000
Research and development |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 1,010,000 | 1,411,000 | 1,316,000
Selling, general and administrative |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | 1,053,000 | 1,199,000 | 951,000
Employee Stock Purchase Plan Year 2007 |  |  |
Stock-based compensation expense by line item |  |  |
Stock-based compensation expense | $ 176,000 | $ 230,000 | $ 211,000

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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