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Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Schedule of Condensed Income Statement [Line Items] |  |  |
Income before income taxes | $ 10,264 | $ 11,300 | $ 7,819
Income taxes | 363 | (162) | (110)
Net income attribute to Deswell Industries, Inc. | 10,627 | 11,138 | 7,709
Total comprehensive income attributable to Deswell Industries, Inc. | 10,627 | 11,138 | 7,709
Parent Company [Member] |  |  |
Schedule of Condensed Income Statement [Line Items] |  |  |
Equity in earnings of subsidiaries | 11,357 | 11,854 | 8,229
Operating expenses | 730 | 716 | 520
Income before income taxes | 10,627 | 11,138 | 7,709
Income taxes |  |  |
Net income attribute to Deswell Industries, Inc. | 10,627 | 11,138 | 7,709
Share of other comprehensive income of subsidiaries |  |  |
Total comprehensive income attributable to Deswell Industries, Inc. | $ 10,627 | $ 11,138 | $ 7,709

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